Hi shasadou,
This question can be solved by TESTing VALUES.
We're told the speed is X miles per hour and the circumference of the tires is Y feet. The question asks how many revolutions each wheel will turn in 1 hour.
Let's keep the values small so the math will be easy:
X = 2
Y = 4
Now the speed is 2 miles per hour, so that's 2(5280 feet) per hour. I'm not going to do that math just yet though….
Since the circumference of the tires is 4 feet, we can figure out the number of revolutions by dividing the distance by 4…
2(5280)/4 = 5280/2 = 2640
When you plug in the above values for X and Y, only one answer matches 2640…
Final Answer:
GMAT assassins aren't born, they're made,
Rich
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