two trains along the same straight railss are moving with constant velocity of 60 km per hour and 30 kilometre per hour towards each other if at time T = 2 second the distance between them 90 kilometre find the time taken when they collide
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Relative velocity =90km/hr
T=d/s =90/90=1 hr
So final answer 60+2 seconds
T=d/s =90/90=1 hr
So final answer 60+2 seconds
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