Question

Two trains, each 50 m long are travelling in opposite direction with velocity 10 ms-1 and 15 ms-1. The time of crossing is​

Answer 1

Explanation:

Total lenght to cross L=50+50=100m

relative velocity (w.r. t. other train)

v=15−(−10)=25m/s

∴t=

v

L

=

25

100

=4s