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Three pipes A,B and C can fill a cistern...

Three pipes A,B and C can fill a cistern in 10h, 12h and 15h respectively. First A was opened. After 1 hour, B was opened and after 2 hours from the start of A, C was also opened. Find the time in which the cistern was just fill

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The correct Answer is:
4 hours 52 min
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