Two pipes A and B can fill a cistern in 37,5 minutes and 45 minutes respectively. Both pipes are opened. The cistern will be filled in just half an hour, if the B is turned off after:
Two pipes A and B can fill a cistern in 37,5 minutes and 45 minutes respectively. Both pipes are opened. The cistern will be filled in just half an hour, if the B is turned off after:
Answers (1)
Let B be turned off after 'x' minutes. Then, Part filled by (A+B) in x min. + Part filled by A in (30-x) min =1