Question:The diameter of the wheel of a vehicle is 1.4 m. The wheel makes 10 revolutions in 5 seconds. The speed of the vehicle (in kmph) is : 

A 29.46 
B 31.68 
C 32.72 
D 36.25 

+ Answer
B 

+ Explanation
Distance covered in 10 revolution

`= (10 xx 2 xx 22/7 xx 0.7) m`

`= 44 m.`

Distance covered in 5 sec.

`= 44 m.`

Speed` = (44/5 xx 60 xx 60 xx 1/1000) kmph`

        `= 31.68 kmph`

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