Two pipes A and B can fill a tank in 40 min. and 60 min. respectively. If both the pipes are used together, then how long will take to fill the tank ?
Solution: Part filled by A in 1 min. = 1/40; part filled by B in 1 min. = 1/60.
Part filled by (A+B) in 1 min. = (1/40 + 1/60) = 1/24.
.'. Both the pipes can fill the tank in 24 minutes.
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