Question:If the wheel of an engine of train `4 2/7` m in circumference will it make in moving 44 km ? 

A 25 km/hr 
B 27 km/hr 
C 30 km/hr 
D 35 km/hr 

+ Answer
B 

+ Explanation
Distance moved in 4 sec.

`= (30/7 xx 7) m`

`= 30 m`

:. Speed` = (30/4 xx 60 xx 60 xx 1/1000)` km/hr`

 = 27 km/hr.

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Irin Moni

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