Question
Two trains of equal lengths take 10 seconds and 15
seconds respectively to cross a telegraph post. If the length of each train be 240 metres, in what time will they cross each other travelling in opposite direction?Solution
Speed of the first train = [240/10] m/sec = 24 m/sec Speed of the second train = [240/15] m/sec = 16 m/sec Speed = (24 + 16) m/sec = 40 m/sec Required time = (480 + 480)/40 sec = 12 sec
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