Question
Two trains of equal lengths take 15 seconds and 30
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 = [240/15] m/sec = 16 m/sec Speed of the second train = [240/30] m/sec = 8 m/sec Speed = (16 + 8) m/sec = 24 m/sec Required time = (240 + 240)/24 sec = 20 sec
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