A Train X starts from Meerut at 4 PM and reaches Delhi at 5 PM. While another Train starts from Delhi at 4 PM and reaches Meerut at 5:30. The two trains will cross each other at? 

Solution(By Examveda Team)

M__________X____________P______90 -X______D
Let ditance between Meerut and Delhi is 90 Km. Let both train crosses each other from a distance X from Meerut.
Speed of first train = 90 kmph.
Speed of second train = 90/(3/2) = 60 kmph.
Time constant in crossing the train. So, speed would be directely propotional to distance covered. [ST =D]

X/(90-X) = 3/2
X = 54 km

Time take to covered 60 km by first train is,
= 54/90 hours= (54*60)/90 = 36 minutes.

So, they meet at 4 :36 PM.