1.

A train 175 m long takes 10 seconds to cross a man standingat the entrance of a tunnel 245 m long. How many secondsafter crossing the man will the train cross the tunnel?12 seconds14 seconds18 seconds24 seconds​

Answer»

Explanation:

velocity of TRAIN = 175/10 = 17.5 m/s

time = DISTANCE / velocity

=( 175 + 245) / 17.5 = 420 / 17.5 = 4200/ 175

= 840/ 35 = 168/ 7 = 24 s



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