Question

A 120 m long train takes 10 seconds to cross a
man standing on the platform. The speed of the
train is
(A) 10 m/sec
(B) 12 m/sec
(C) 15 m/sec
(D) 20 m/sec​

Answer 1

As the size of train is 120m then it will need to cover 120 m to go across the man
Therefore. Distance travelled =120 m
Time=t=10 sec
Speed =dist./time
=120/10
=12 m/s
opt(B)