Gurpinder wrote:
Since the answer choices contain a variable, we can plug in.
Let x = 10 meters/sec.
1 hour = 3600 seconds, so every hour we'll go r*t = 10*3600 = 36000 meters = 36 kilometers.
Thus, y = 36 kilometers/hour. This is our target answer.
Now we plug x=10 into all the answer choices to see which yields our target answer of 36.
Only answer choice C works:
18x/5 = 18*10/5 = 36.
The correct answer is
C.
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