Question

Train A and Train B travel towards each other along a parallel track. Their speeds are 18m/s and 14m/s respectively. A commuter on Train A observes that Train B takes 6 seconds to pass him completely. How long is Trainl B?

Answer 1

Relative speed=if opposite direction 18 +14
32 =
upto six seconds commutator recorded B is there.
thats B crossed A in 6 seconds.
so lenght of train B is 32×6
=192m

Answer 2

Here, train A and train B cross each other in 6 seconds.
Thus, train A travels in 6 seconds = 6 * 18 = 108 m
And train B travels in 6 seconds = 6 * 14 = 84 m
Now, we have that length of train B is = 84 + 108 = 192 m
Thus, train B has a length of 192 m.

Hope this helps,.. ^_^