two trains of equal lengths take 10 seconds and 15 seconds respectively to cross a telegraph post. if the length of each train be 120 meters in what time (in seconds) will they cross each other travelling in opposite direction?
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The velocity of 2nd train relative to first train is 15-(-10)=25m/s. They have to travel 120+120=240 meters.
This means: 240/25=9.6 seconds to cross each other.
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