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GMAT Prep Question : Mensuration : Dec 07, 04
A wheel of a car of radius 21 cms is rotating at 600 RPM. What is the speed of the car in km/hr?
- 79.2 km/hr
- 47.52 km/hr
- 7.92 km/hr
- 39.6 km/hr
- 3.96 km/hr
Correct Choice (B) Answer (47.52 km/hr)
Explanatory Answer
The radius of the wheel is 21 cms.
Therefore, in one revolution, the wheel will cover a distance of  = 132 cms.
In a minute, the wheel will cover a distance of 132 * 600 = 79200 cms.
In an hour, the wheel will cover a distance of 79200 * 60 = 4752000 cms.
Therefore, the speed of the car = 4752000 cms/hr = 47.52 km/hr
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