A man standing on a moving escalator, completes a certain distance in time `t_(1)`. If the escalator does not move then man covers this distance in time `t_(2)` by walking.
(i) How much time will he take to cover the same distance if he move on the moving escalator in the same direction ?
(ii) How much time will he take to cover the same distance if he move on the moving escalator in the opposite direction ?

Answer

(i)`(t_(1)t_(2))/(t_(1)+t_(2))`,
(ii)`(t_(1)t_(2))/(|t_(1)-t_(2)|)`