Question

Two trains P and Q each of length 100 m are
moving on parallel tracks at 72 kmph and 90 kmph
respectively in the same direction. Initially Q is 1
km behind P. Time after which Q completely overtakes p is

(1) 245min
(2) 4min
(3) 4sec
(4) 4 hour​

Answer 1

Answer:

4sec

Explanation:

20m/s

25m/s

Vab = 25-20

200÷50