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Rhonda runs at an average speed of 12 kilometers per hour,

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Rhonda runs at an average speed of 12 kilometers per hour,  [#permalink]

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13 Feb 2017, 10:39
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Difficulty:

55% (hard)

Question Stats:

72% (02:26) correct 28% (03:06) wrong based on 286 sessions

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Rhonda runs at an average speed of 12 kilometers per hour, and she bicycles at an average speed of 30 kilometers per hour. When she bicycles to work, her travel time is 2.25 minutes less than when she runs to work. The distance to work, in kilometers, is

A) 27/40
B) 3/4
C) 7/8
D) 11/12
E) 6/5

*kudos for all correct solutions

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Joined: 05 Mar 2015
Posts: 1003
Re: Rhonda runs at an average speed of 12 kilometers per hour,  [#permalink]

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13 Feb 2017, 11:14
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GMATPrepNow wrote:
Rhonda runs at an average speed of 12 kilometers per hour, and she bicycles at an average speed of 30 kilometers per hour. When she bicycles to work, her travel time is 2.25 minutes less than when she runs to work. The distance to work, in kilometers, is

A) 27/40
B) 3/4
C) 7/8
D) 11/12
E) 6/5

*kudos for all correct solutions

Let distance be x then

x/12 = x/30+2.25/60
solving
x=3/4 km

Ans B
General Discussion
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Joined: 11 Sep 2015
Posts: 3341
Re: Rhonda runs at an average speed of 12 kilometers per hour,  [#permalink]

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13 Feb 2017, 14:27
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2
GMATPrepNow wrote:
Rhonda runs at an average speed of 12 kilometers per hour, and she bicycles at an average speed of 30 kilometers per hour. When she bicycles to work, her travel time is 2.25 minutes less than when she runs to work. The distance to work, in kilometers, is

A) 27/40
B) 3/4
C) 7/8
D) 11/12
E) 6/5

When Rhonda bicycles to work, her travel time is 2.25 minutes less than when she runs to work
(Rhonda's running time in hours) = (Rhonda's cycling time in hours) + 2.25/60
Aside: 2.25 minutes = 2.25/60 hours

travel time = distance/speed
We know the running and cycling speeds, but we don't know the distance.
So, let d = distance to work

So, we get: d/12 = d/30 + 2.25/60
To eliminate the fractions, multiply both sides by 60 (the LCM of 12, 30 and 60)
We get: 5d = 2d + 2.25
Subtract 2d from both sides: 3d = 2.25
Solve: d = 2.25/3
Check answer choices . . . not there.

Looks like we need to rewrite 2.25/3 as an equivalent fraction.
If we take 2.25/3, and multiply top and bottom by 4 we get: 9/12, which is the same as 3/4

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Re: Rhonda runs at an average speed of 12 kilometers per hour,  [#permalink]

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13 Feb 2017, 18:06
1
GMATPrepNow wrote:
Rhonda runs at an average speed of 12 kilometers per hour, and she bicycles at an average speed of 30 kilometers per hour. When she bicycles to work, her travel time is 2.25 minutes less than when she runs to work. The distance to work, in kilometers, is

A) 27/40
B) 3/4
C) 7/8
D) 11/12
E) 6/5

*kudos for all correct solutions

$$Average speed (run) =$$ $$12 \frac{km}{hr}$$

$$Average speed (bicycle) =$$ $$30 \frac{km}{hr}$$
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Rhonda runs at an average speed of 12 kilometers per hour,  [#permalink]

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13 Feb 2017, 18:11
2
ziyuenlau wrote:
GMATPrepNow wrote:
Rhonda runs at an average speed of 12 kilometers per hour, and she bicycles at an average speed of 30 kilometers per hour. When she bicycles to work, her travel time is 2.25 minutes less than when she runs to work. The distance to work, in kilometers, is

A) 27/40
B) 3/4
C) 7/8
D) 11/12
E) 6/5

*kudos for all correct solutions

Average speed (run) = $$12 \frac{km}{hr}$$

Average speed (bicycle) = $$30 \frac{km}{hr}$$

$$Distance = Speed*Time$$

Average Time = $$\frac{Average Distance}{{Average Speed}}$$

$$Time (Bicycle) = Time (Run) - 2.25 min$$

$$[\frac{(distance)}{{30km/hr}}]*(\frac{60min}{1hr})$$$$=[\frac{(distance)}{{12km/hr}}]*(\frac{60min}{hr}) - 2.25min$$

$$2*distance = 5*distance - 2.25$$

$$3*distance = 2.25$$

$$distance = \frac{3}{4}$$
_________________

"Be challenged at EVERY MOMENT."

“Strength doesn’t come from what you can do. It comes from overcoming the things you once thought you couldn’t.”

"Each stage of the journey is crucial to attaining new heights of knowledge."

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Joined: 28 Jun 2016
Posts: 6
Re: Rhonda runs at an average speed of 12 kilometers per hour,  [#permalink]

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24 Feb 2017, 08:55
1
Let x minutes takes to reach office while running

So (x -2.25) minutes by bicycle to reach office

Distance by run = Distance by bicycle

x*12 = 30*(x - 2.25)

Solve it. x = 15/4 minutes i.e 1/16 hours

Distance = 12 *x or 30*x - 2.25) = 12 * 1/16 = 3/4
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Re: Rhonda runs at an average speed of 12 kilometers per hour,  [#permalink]

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24 Feb 2017, 10:56
1
GMATPrepNow wrote:
Rhonda runs at an average speed of 12 kilometers per hour, and she bicycles at an average speed of 30 kilometers per hour. When she bicycles to work, her travel time is 2.25 minutes less than when she runs to work. The distance to work, in kilometers, is

A) 27/40
B) 3/4
C) 7/8
D) 11/12
E) 6/5

*kudos for all correct solutions

let t=running time
12/30=(t-3/80)/t
t=1/16 hr
1/16 hr*12 kph=3/4 k distance
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Re: Rhonda runs at an average speed of 12 kilometers per hour,  [#permalink]

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12 Dec 2017, 09:58
1
GMATPrepNow wrote:
Rhonda runs at an average speed of 12 kilometers per hour, and she bicycles at an average speed of 30 kilometers per hour. When she bicycles to work, her travel time is 2.25 minutes less than when she runs to work. The distance to work, in kilometers, is

A) 27/40
B) 3/4
C) 7/8
D) 11/12
E) 6/5

We are given that Rhonda runs at an average speed of 12 kilometers per hour and bicycles at an average speed of 30 kilometers per hour. We are also given that when she bicycles to work, her travel time is 2.25 minutes less than when she runs to work.

Since she runs and bicycles the same distance, we can let her distance from home to work = d.

Since time = distance/rate, her time running to work is d/12 and her time bicycling to work is d/30. We also need to convert 2.25 minutes to hours.

2.25 minutes = 2.25/60 = 9/240 = 3/80 hour

We can create the following equation and determine d:

d/12 = 3/80 + d/30

Multiplying the entire equation by 240, we have:

20d = 9 + 8d

12d = 9

d = 9/12 = 3/4

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Joined: 09 Mar 2016
Posts: 1288
Re: Rhonda runs at an average speed of 12 kilometers per hour,  [#permalink]

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03 Feb 2018, 05:13
GMATPrepNow wrote:
GMATPrepNow wrote:
Rhonda runs at an average speed of 12 kilometers per hour, and she bicycles at an average speed of 30 kilometers per hour. When she bicycles to work, her travel time is 2.25 minutes less than when she runs to work. The distance to work, in kilometers, is

A) 27/40
B) 3/4
C) 7/8
D) 11/12
E) 6/5

When Rhonda bicycles to work, her travel time is 2.25 minutes less than when she runs to work
(Rhonda's running time in hours) = (Rhonda's cycling time in hours) + 2.25/60
Aside: 2.25 minutes = 2.25/60 hours

Hi GMATPrepNow

Why do you divide 2.25 by 60 ? what is the point? And why by 60 ? where from did you get 60?

thank you
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Re: Rhonda runs at an average speed of 12 kilometers per hour,  [#permalink]

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03 Feb 2018, 08:53
GMATPrepNow wrote:
Rhonda runs at an average speed of 12 kilometers per hour, and she bicycles at an average speed of 30 kilometers per hour. When she bicycles to work, her travel time is 2.25 minutes less than when she runs to work. The distance to work, in kilometers, is

A) 27/40
B) 3/4
C) 7/8
D) 11/12
E) 6/5

*kudos for all correct solutions

Let d be the distance.

$$\frac{d}{12} - \frac{d}{30} = \frac{2.25}{60}$$

$$d = 0.75$$
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Posts: 3341
Re: Rhonda runs at an average speed of 12 kilometers per hour,  [#permalink]

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05 Feb 2018, 07:49
Top Contributor
dave13 wrote:
GMATPrepNow wrote:
GMATPrepNow wrote:
Rhonda runs at an average speed of 12 kilometers per hour, and she bicycles at an average speed of 30 kilometers per hour. When she bicycles to work, her travel time is 2.25 minutes less than when she runs to work. The distance to work, in kilometers, is

A) 27/40
B) 3/4
C) 7/8
D) 11/12
E) 6/5

When Rhonda bicycles to work, her travel time is 2.25 minutes less than when she runs to work
(Rhonda's running time in hours) = (Rhonda's cycling time in hours) + 2.25/60
Aside: 2.25 minutes = 2.25/60 hours

Hi GMATPrepNow

Why do you divide 2.25 by 60 ? what is the point? And why by 60 ? where from did you get 60?

thank you

Time in hours = (time in minutes)/60

For example, 30 minutes = 30/60 hours = 1/2 hour
And 45 minutes = 45/60 hours = 3/4 hour
And 10 minutes = 10/60 hours = 1/6 hour

So, 2.25 minutes = 2.25/60 hours
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Intern
Joined: 07 Apr 2018
Posts: 3
Re: Rhonda runs at an average speed of 12 kilometers per hour,  [#permalink]

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10 Nov 2018, 13:19
KARTAB wrote:
Let x minutes takes to reach office while running

So (x -2.25) minutes by bicycle to reach office

Distance by run = Distance by bicycle

x*12 = 30*(x - 2.25)

Solve it. x = 15/4 minutes i.e 1/16 hours

Distance = 12 *x or 30*x - 2.25) = 12 * 1/16 = 3/4

You are the only one who has tried solving it via equating distance and not the time. However, how do you get to 15/4? Shouldn't you be dividing 2.25 minutes by 60 to convert into hours or shouldn't you be converting speed per hour into speed per minute?
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Joined: 10 May 2018
Posts: 34
Re: Rhonda runs at an average speed of 12 kilometers per hour,  [#permalink]

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22 Nov 2018, 14:11
GMATPrepNow wrote:
Rhonda runs at an average speed of 12 kilometers per hour, and she bicycles at an average speed of 30 kilometers per hour. When she bicycles to work, her travel time is 2.25 minutes less than when she runs to work. The distance to work, in kilometers, is

A) 27/40
B) 3/4
C) 7/8
D) 11/12
E) 6/5

*kudos for all correct solutions

Let the distance be X

X/12 - X/30 = 2.25/60.

Solving for X, we get X = 0.75

B.
Re: Rhonda runs at an average speed of 12 kilometers per hour, &nbs [#permalink] 22 Nov 2018, 14:11
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