alex.gellatly 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? (1kilometer = 1,000 meters)
5x/18
6x/5
18x/5
60x
3600000x
Let x = 1 meter per second.
Since there are 3600 seconds in an hour, the distance traveled in one hour = 3600 meters = 3.6 kilometers.
Thus, y = 3.6 = 36/10 = 18/5. This is our target.
Now we plug x=1 into the answer choices to see which yields our target of 18/5.
A quick scan reveals that only
C works:
18x/5 = (18*1)/5 = 18/5.
The correct answer is
C.
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