Question

A train 175 m long takes 10 seconds to cross a man standing
at the entrance of a tunnel 245 m long. How many seconds
after crossing the man will the train cross the tunnel?
12 seconds
14 seconds
18 seconds
24 seconds​

Answer 1

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