Two pipes A and B can fill a tank in 20 hours and 30 hours respectively. If both the pipes are opened simultaneously, in how much time the tank will be filled completely?
Part filled by A in 1 hour = 1/20 ⇒ Part filled by B in 1 hour = 1/30 ⇒ Part filled by ( A + B) in 1 hour = 1/20 + 1/30 = 5/60 = 1/12 ∴ Hence, both the pipes together will fill the tank in 12 hours.
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