Question:A 180 m long train crosses a man standing on the platform in 6 seconds. What is the speed of the train ? 

A 90 km∕hr 
B 108 km∕hr 
C 120 km∕hr 
D 88 km∕hr 

+ Answer
B 

+ Explanation
Speed of the train` = (180/6)` m∕sec. = 30 m∕sec.

      `= (30 xx 18/5)` km∕hr = 108 km∕hr.

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Irin Moni

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