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How many minutes does it take to travel 120 miles at 400 mil

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How many minutes does it take to travel 120 miles at 400 mil  [#permalink]

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New post 05 Jan 2014, 13:07
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A
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D
E

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Question Stats:

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The Official Guide For GMAT® Quantitative Review, 2ND Edition

How many minutes does it take to travel 120 miles at 400 miles per hour?

(A) 3
(B) 3 1/3
(C) 8 2/3
(D) 12
(E) 18

Problem Solving
Question: 23
Category: Arithmetic Operations on rational numbers
Page: 64
Difficulty: 500


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Re: How many minutes does it take to travel 120 miles at 400 mil  [#permalink]

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New post 05 Jan 2014, 13:08
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Re: How many minutes does it take to travel 120 miles at 400 mil  [#permalink]

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New post 05 Jan 2014, 21:26
Distance, D = 120 miles;
Rate, R = 400miles/hr;

Time, T = D/R = (120/400) hours = 0.3 hours;

The question asks us the answer in minutes; Therefore, 0.3 * 60 mins = 18 mins;

(E) is the answer.
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Re: How many minutes does it take to travel 120 miles at 400 mil  [#permalink]

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New post Updated on: 06 Jan 2014, 08:55
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When working on a rate question (one involving distance or work) remember to always jot down the formula - Distance = speed*time. Also make sure to be aware of the units used and the possible need for conversion.

The rate is given in miles/hour, but we are looking for an answer in miles/minute

D=S*T
120 miles = 400 miles/hr * 1 hr/60 min * T
120 miles = 20 miles/3 mins * T
120 miles * 3 mins/20 miles = T
18 minutes = t Answer Choice E

Remember you can save time on this problem by calculating in fewer steps; I described every step to give a comprehensive view to students of all different levels. Remember that you have approximately 2 minutes to solve a GMAT Quantitative Question (you need to answer every question in the section), so whenever you can save time please do :)

Originally posted by Cbri on 06 Jan 2014, 08:45.
Last edited by Cbri on 06 Jan 2014, 08:55, edited 2 times in total.
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Re: How many minutes does it take to travel 120 miles at 400 mil  [#permalink]

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New post 06 Jan 2014, 08:50
Bunuel wrote:
The Official Guide For GMAT® Quantitative Review, 2ND Edition

How many minutes does it take to travel 120 miles at 400 miles per hour?

(A) 3
(B) 3 1/3
(C) 8 2/3
(D) 12
(E) 18



Difficulty level : sub 500 (not even required to calculate).

120/400 * 60 = 18 mins - Option E)
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Re: How many minutes does it take to travel 120 miles at 400 mil  [#permalink]

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New post 06 Jan 2014, 23:52
400 miles=1 hr or 60 min.
1 mile=6/40 min.
120 miles=6/40*120=18 min.
Ans:E
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Re: How many minutes does it take to travel 120 miles at 400 mil  [#permalink]

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New post 19 Jan 2016, 00:46
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it takes 15 min to make 100 miles, so we cut-off 4 choices.
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How many minutes does it take to travel 120 miles at 400 mil  [#permalink]

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New post Updated on: 15 Jun 2016, 04:38
(120/400)*60 = 18 mins
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Originally posted by rishi02 on 15 Jun 2016, 04:06.
Last edited by rishi02 on 15 Jun 2016, 04:38, edited 1 time in total.
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Re: How many minutes does it take to travel 120 miles at 400 mil  [#permalink]

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New post 15 Jun 2016, 04:22
Bunuel wrote:
The Official Guide For GMAT® Quantitative Review, 2ND Edition

How many minutes does it take to travel 120 miles at 400 miles per hour?

(A) 3
(B) 3 1/3
(C) 8 2/3
(D) 12
(E) 18


Time = \frac{Distance}{Speed}

Time = \frac{120}{400} Hours. (Note the units)
For getting answers in minute, multiply it by 60 (1 hour = 60 minute)
= 18 minutes

E is the answer.
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Re: How many minutes does it take to travel 120 miles at 400 mil  [#permalink]

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Re: How many minutes does it take to travel 120 miles at 400 mil   [#permalink] 23 Dec 2017, 01:46
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