Two parallel rail tracks run north and south directions . Train B moves south at a speed of 90km/hr. Train A moves at a speed of 54km/hr.
(a) Find the velocity of B with respect to A .
(b) Find velocity of ground with respect to train B .
(c) Velocity of a monkey running on the roof of the train A against motion as observed by a man standing on the ground. (monkey moves with a velocity of 18km/hr relative to the train A ).

Question

Two parallel rail tracks run north and south directions . Train B moves south at a speed of 90km/hr. Train A moves at a speed of 54km/hr.
(a) Find the velocity of B with respect to A .
(b) Find velocity of ground with respect to train B .
(c) Velocity of a monkey running on the roof of the train A against motion as observed by a man standing on the ground. (monkey moves with a velocity of 18km/hr relative to the train A ).

anonymous · Answer

Hey....it is an  example question so answer is given in ur book lol

anonymous · Answer

i know , I want to understand the way the last part is done.

anonymous · Answer

So you've got 54km/h and a monkey moving in the opposite direction at 18km/h.|dw:1344438663642:dw|
What do you want your plus x direction to be? (to the left or the right?)