Two pipes A and B can fill a tank in 36 hours and 45 hours respectively. If both the pipes are opened simultaneously, how much time will be taken to fill the tank?
Part filled by A In 1 hour = 1/36
Part filled by B in 1 hour = 1/45
Part filled by (A + B) In 1 hour = [1/36 + 1/45] = 9/180 = 1/20
Hence, both the pipes together will fill the tank in 20 hours.
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