Two trains along the same straight rails moving with constant speed 60 km/hr and 30 km/hr respectively towards each other. If at time t = 0, the distance between them is 90 km, the time when they collide is

(a) 1 hr

(2) 2 hr

(3) 3 hr

(4) 4 hr

Concept Videos :-

#35-Intro-to-Relative-Motion
#36-Solved-Examples-19
#37-Solved-Examples-20
#38-Concept-of-River-Man-Problem
#39-Solved-Examples-21
#40-Rain-Man-Problem
#41-Wind-Plane-Problem

Concept Questions :-

Relative motion
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