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

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

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New post 09 Feb 2018, 20:36
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

81% (00:39) correct 19% (00:35) wrong based on 74 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
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Re: At a constant speed of 72 kilometers per hour, a vehicle travels  [#permalink]

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New post 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).
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Re: At a constant speed of 72 kilometers per hour, a vehicle travels  [#permalink]

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New post 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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Re: At a constant speed of 72 kilometers per hour, a vehicle travels  [#permalink]

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New post 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
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Re: At a constant speed of 72 kilometers per hour, a vehicle travels  [#permalink]

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New post 10 Feb 2018, 00:21
72 kmph

in km/sec

convert hours into seconds
1 hr = 3600 seconds

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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New post 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.
So answer is A
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Re: At a constant speed of 72 kilometers per hour, a vehicle travels  [#permalink]

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New post 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...

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Re: At a constant speed of 72 kilometers per hour, a vehicle travels &nbs [#permalink] 21 Oct 2018, 13:30
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