31. Train a running at 108km/h takes 15sec to cross a pole. How much time will train b take (running at 54 km/h) to cross the pole. If lis length is one-third that of train a ? (in sec)
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Answer:10
Explanation:
Train A , speed= 108 km/hr = 108*(5/18) m/sec = 30 m/sec
time= 15 sec
length(distance)= speed * time
length of train A= 30*15= 450 m
train B, speed = 54km/hr =15 m/sec
length of B= 1/3 of length of A =450/3 =150 m
time= 150/15 = 10
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