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M14-06

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Bunuel
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M14-06 [#permalink] New post  16 Sep 2014, 00:51
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If an athlete ran the first half of a 200-meter race in 10 seconds and the second half in 12 seconds, by how much was his average speed over the first half larger than that over the second?

A. 2.0 km/h
B. 3.0 km/h
C. 3.6 km/h
D. 6.0 km/h
E. 7.2 km/h
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Bunuel
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Re M14-06 [#permalink] New post  16 Sep 2014, 00:51
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If an athlete ran the first half of a 200-meter race in 10 seconds and the second half in 12 seconds, by how much was his average speed over the first half larger than that over the second?

A. 2.0 km/h
B. 3.0 km/h
C. 3.6 km/h
D. 6.0 km/h
E. 7.2 km/h

The runner's average speed over the first 100 meters was 10 m/s or \(3600*\frac{10}{1000} = 36\) km/h. The runner's average speed over the second 100 meters was \(\frac{100}{12}\) m/s or \(3600*\frac{100}{12*1000} = 30\) km/h. The difference is 6 km/h.

Answer: D
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Re: M14-06 [#permalink] New post  08 Dec 2016, 08:47
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I don't like how you don't post the conversion formulas. On the test the formulas are provided thus your questions without them are unrealistic and unnecessarily difficult.
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Bunuel
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Re: M14-06 [#permalink] New post  08 Dec 2016, 13:48
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Mermaidk wrote:
I don't like how you don't post the conversion formulas. On the test the formulas are provided thus your questions without them are unrealistic and unnecessarily difficult.


This type of questions are called conversion problems and they never provide with any formula.

Check other Conversion problems to practice from our Special Questions Directory.
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Re: M14-06 [#permalink] New post  09 Oct 2017, 19:15
Could you please explain this part 3600∗[10][/1000]=36 kmh
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Re: M14-06 [#permalink] New post  09 Oct 2017, 19:45
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Voksu wrote:
Could you please explain this part 3600∗[10][/1000]=36 kmh



Hi...
You have to convert m into km and sec into h...
So 10m/s
1m= 1/1000 km ..... 10m=10/1000
1hour=60minutes..
And 1minute=60sec, so 1h =60*60 sec=3600sec
Therefore 1sec=1/3600 h...
Substitute in 10m/s....
(10/1000)/(1/3600)=3600*10/1000 kmph..
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Re: M14-06 [#permalink] New post  14 Oct 2019, 11:25
It should be Kmph in the answer choice, right?
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Re: M14-06 [#permalink] New post  14 Oct 2019, 20:56
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Amit700 wrote:
It should be Kmph in the answer choice, right?


Yes. Kilometre per hour, kmph or km/h.
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Re M14-06 [#permalink] New post  11 Jun 2020, 05:17
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I think this is a high-quality question and I agree with explanation.
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Re: M14-06 [#permalink] New post  25 Apr 2021, 10:37
Am I the only one who did not assume that the first half was equal to the second?
I went with d meters = first half, hence second half was (100-d) metres
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Re: M14-06 [#permalink] New post  15 Aug 2021, 09:03
Somehow it was difficult to understand.
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Re: If an athelete ran the first half of a 200 meter race in 10 [#permalink] New post  12 Dec 2021, 11:08
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

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Re: If an athelete ran the first half of a 200 meter race in 10 [#permalink]
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