x meters/sec = y km/hr, 1km=1000 meters
you can covert either x or y, your choice.
Convert Y
y = 1km/1 hr
1km = 1000 meters
1 meter = 1/1000 kms
1hr = 60*60 secs
1 sec = 1/3600 sec
Here is simple way of doing this problem, without leaving any room for silly mistakes
y = [1/1000] / [1/3600]
cross multiply
y[1/3600] / [1/1000] = y's speed in meter/sec
y * 1000 / 3600 = y*5/18
x=y*5/18
y = 18x/5
Hence C
Let me know if you have any doubts.
Whats the OA? I am pretty sure this correct, i'll be really surprised if A turns out to be the answer.
gmatprep
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parallel_chase
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