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Speed of x meters in terms of y kilometers??? NEED HELP!!!

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by srcc25anu » Wed Jun 05, 2013 1:27 pm
X m/sec if converted to km/hour would be (X * 3600) / 1000 or 18x/5 km/hr
1 km = 1000 mts
1 hr = 3600 secs
Therefore Y km/hr = 18X/5 km/hr
therefore Y = 18X/5
Ans C
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by GMATGuruNY » Thu Jun 06, 2013 2:55 am
Holden123 wrote:If the speed of x meters per second is equivalent to the speed of y kilometers per hour, what is y in terms of x ?

(A) 5x/18
(B) 6x/5
(C) 18x/5
(D) 60x
(E) 3,600,000x
Plug in for x a value that is easy to convert from meters to kilometers.

Let x = 1000 meters per second.
Since 1000 meters = 1 kilometer, this rate = 1 kilometer per second.
Since there are 3600 seconds in an hour, 1 kilometer per second = 3600 kilometers per hour.
Thus, y = 3600. This is our target.

Now plug x = 1000 into the answer choices to see which yields our target of 3600.
Only C works:
18x/5 = (18*1000)/5 = 3600.

The correct answer is C.
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