Question:The radius of a wheel is 7 cm. How many revolutions will it make in moving 44 km ? 

A 2000 
B 10000 
C 70000 
D 100000 

+ Answer
D 

+ Explanation
Distance covered in 1 revolution = circumference

`= (2 xx 22/7 xx 7) cm`

`= 44 cm`

:.Number of revolutions made in moving 44 km

`= ((44 xx 1000 xx 100)/44)`

`= 100000`

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Irin Moni

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