Two trains of equal lengths take 15 seconds and 30 seconds respectively to cross a telegraph post. If the length of each train be 180 metres, in what time will they cross each other travelling in opposite direction?
Speed of the first train = [180/15] m/sec = 12 m/sec Speed of the second train = [180/30] m/sec = 6 m/sec Speed = (12 + 6) m/sec = 18 m/sec Required time = (180 + 180)/18 sec = 20 sec
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