Question

Two parallel rail tracks run north- south. Train A moves north with a speed of 54 km h-1 , and train B moves south with a speed of 90 km h-1. What is the

a) relative velocity of B with respect to A?

b) relative velocity of ground with respect to B?

Answer 1

a)as both are moving in opp direction , their velocity will add up

=90+54=144km/hr

b) it will be same as b's velocity = 90km/hr