Question

Two identical trains take 3 sec. to pass one another when going in opposite direction. But takes only
2.5 sec, if the speed of one is increased by 50%. The time one would take to pass the other when going in
the same direction at their original speed is-
(1) 10 sec.
(2) 12 sec.
(3) 15 sec.
(4) 18 sec.
E-- alavator drons acoin The coin reaches the floor of the elevator in a time​

Answer 1

Answer:

15 seconds

Explanation:

Apply relative motion concept

See the image for solution