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M21 #12

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Intern
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M21 #12 [#permalink] New post 06 May 2012, 10:39
If the diameter of each of a car's wheels is 0.4 meters, approximately, what was the average speed of the car for its three-hour trip in which each wheel made 100,000 revolutions?

33 kmh
35 kmh
42 kmh
47 kmh
51 kmh

CAN SOMEONE PLEASE EXPLAIN WHAT IS THE BET WAY TO APPROACH THIS KIND OF QUESTIONS?
Manager
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Joined: 19 Mar 2012
Posts: 174
Location: United States
Concentration: Finance, General Management
GMAT 1: 750 Q50 V42
GPA: 3.69
WE: Analyst (Mutual Funds and Brokerage)
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Re: M21 #12 [#permalink] New post 06 May 2012, 11:16
One revolution equals te circumference of a wheel:

C = 2pi(r) = .4xpi= 1.25

So 100,000 revs is 125,000

divide that by 3 hours and you get about 42 km per hour
Re: M21 #12   [#permalink] 06 May 2012, 11:16
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M21 #12

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