Question

20.
Two trains each of length 50 m. are running with
constant speeds on parallel tracks. While moving
in same direction one over takes the other in 40
seconds and while moving in opposite direction
one crosses the other in 20 seconds. The speeds
of trains will be :-
(1) 2.25 ms 1 and 2.75 ms 1
(2) 2.15 ms1 and 2.85 ms!
(3) 3.75 ms and 1.25 msi
(4) 4.25 mg-1 and 0.75 ms​

Answer 1

Answer:

Here we will learn about the concept of two trains passes in the opposite direction.

When two train passes a moving object (having some length) in the opposite direction

Let length of faster train be l meters and length of slower train be m meters

Let the speed of faster train be x km/hr

Relative speed = (x + y) km/hr.

Then, time taken by the faster train to pass the slower train = (l + m) meters/(x + y) km/hr

Now we will learn to calculate when two trains running on parallel tracks (having some length) in the opposite direction.