The diameter of a bullock cart wheel is 1411 metres This wheel makes ten complete revolutions per minute What would be the speed of the cart in kilometres per hour
4.8
9.6
8.8
2.4
A
9.6
B
4.8
C
8.8
D
2.4
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Solution
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Radius =12×1411=711m ∴ Perimeter =2πr=2×227×711m=4m Thus the wheel covers 4 meters in one revolution i.e. 40 meters in 10 revolutions Hence the distance of meter is covers in one minute i.e. 2400meter in 40 minutes i.e. 2.4 km in one hour
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