Two trains having equal lengths, take 10 seconds and 15 seconds respectively to cross a post. If the length of each train is 120 metres, in what time (in seconds) will they cross each other when travelling in opposite direction?

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Two trains having equal lengths, take 10 seconds and 15 seconds respectively to cross a post. If the length of each train is 120 metres, in what time (in seconds) will they cross each other when travelling in opposite direction?