Question

Two trains 140 m and 160 m long run at the speed of 60 km per hour and 40 km per hour respectively in opposite direction and parallel tracks that time in seconds which day take to cross each other

Answer 1

1st Train Length=140 m

Speed=60 km/h

In m/s=16.66 m/s

Approx=17 m/s

2nd Train Length=160 m

Speed=40 km/h

in m/s=11.11 m/s

Approx=11 m/s

Trains Have meet now .Now when it totally cross.

Total Distance=140+160=300 m

Total Speed=17+11=28m/s

Time=Distance/Speed

=300/28

=10.71 Seconds

Approx=11 Seconds.

$\boxed{\mathbf{Time=11\: Seconds}}$