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# At a constant speed of 72 kilometers per hour, a vehicle travels

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Intern
Joined: 16 Oct 2017
Posts: 37
At a constant speed of 72 kilometers per hour, a vehicle travels  [#permalink]

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09 Feb 2018, 20:36
2
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Difficulty:

15% (low)

Question Stats:

78% (01:04) correct 22% (01:08) wrong based on 129 sessions

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At a constant speed of 72 kilometers per hour, a vehicle travels how many kilometers per second?

A) 0.02
B) 0.2
C) 0.6
D) 1.2
E) 6.0
Intern
Joined: 31 Dec 2017
Posts: 28
Concentration: Finance
Re: At a constant speed of 72 kilometers per hour, a vehicle travels  [#permalink]

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09 Feb 2018, 21:03
OCDianaOC wrote:
At a constant speed of 72 kilometers per hour, a vehicle travels how many kilometers per second?

A) 0.02
B) 0.2
C) 0.6
D) 1.2
E) 6.0

72 kilometers in 60 mins, there are 60*60 = 3600 secs in 60 mins, so distance travelled in one second = 72/3600 = 2/100 = 0.02. (A).
Math Expert
Joined: 02 Aug 2009
Posts: 8309
Re: At a constant speed of 72 kilometers per hour, a vehicle travels  [#permalink]

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09 Feb 2018, 21:43
OCDianaOC wrote:
At a constant speed of 72 kilometers per hour, a vehicle travels how many kilometers per second?

A) 0.02
B) 0.2
C) 0.6
D) 1.2
E) 6.0

The number is in km per hour but answer asked is in km per second...
So 72 km per hour = $$\frac{72}{60*60}=\frac{72}{36*100}=\frac{2}{100}=0.02$$
A
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Posts: 334
Re: At a constant speed of 72 kilometers per hour, a vehicle travels  [#permalink]

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09 Feb 2018, 23:51
72 kilometers per hour translates to 72 kilometers in 3600 seconds.

Distance traveled per second = 72/3600 = 0.02

Ans: A
Current Student
Joined: 07 Jan 2016
Posts: 1081
Location: India
GMAT 1: 710 Q49 V36
Re: At a constant speed of 72 kilometers per hour, a vehicle travels  [#permalink]

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10 Feb 2018, 00:21
72 kmph

in km/sec

convert hours into seconds
1 hr = 3600 seconds

72/3600

2/100

0.02
Intern
Joined: 31 Jan 2018
Posts: 16
Re: At a constant speed of 72 kilometers per hour, a vehicle travels  [#permalink]

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10 Feb 2018, 06:15
72 kilometers in 60 mins, there are 60*60 = 3600 secs in 60 mins, so distance travelled in one second = 72/3600 = 2/100 = 0.02.
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Re: At a constant speed of 72 kilometers per hour, a vehicle travels  [#permalink]

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21 Oct 2018, 13:30
Hi All,

We're told that a vehicles travels at a constant speed of 72 kilometers per HOUR. We're asked what that speed is in kilometers per SECOND. This question is really just about 'unit conversions', although at a certain point you can use the 'spread' of the answer choices to your advantage and stop doing 'math.'

1 hour = 60 minutes
1 minute = 60 seconds
1 hour = (60)(60) = 3600 seconds

72 km/3600 seconds

Since 72/720 = .1, we know that 72/3600 is far LOWER than .1
There's only one answer that matches...

GMAT assassins aren't born, they're made,
Rich
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Re: At a constant speed of 72 kilometers per hour, a vehicle travels  [#permalink]

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25 Oct 2018, 09:29
OCDianaOC wrote:
At a constant speed of 72 kilometers per hour, a vehicle travels how many kilometers per second?

A) 0.02
B) 0.2
C) 0.6
D) 1.2
E) 6.0

Since 1 hour = 3600 seconds, 72 km/hour = 72/3600 = 1/50 = 0.02 km/second.

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Re: At a constant speed of 72 kilometers per hour, a vehicle travels   [#permalink] 25 Oct 2018, 09:29
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