Two filling pipes can fill a cistern in 10 and 12 minutes respectively and when the waste pipe is
open, they can together fill it in 15 minutes. The waste pipe can empty the full cistern in
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Step-by-step explanation:
The two inlet pipes can fill the cistern in 10 min and 15 min respectively and the outlet pipe can empty at the rate of 5 min. When all 3 pipes are kept open simultaneously, the quantum of water filled in 1 minute = 110+115−15=−130 or 130th of the tank gets emptied in a minute.
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