1. Two pipes A and B can fill a tan...
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1. Two pipes A and B can fill a tank in 20 min and 30 min respectively. If both pipes are opened together, the time taken to fill the tank is (1) 50 min (2) 12 min (3) 25 min (4) 15 min

11th - 12th Class
Maths
Solution
90
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1. ( (2) x=20 ) min and ( y=30 ) min ( begin{aligned} therefore text { Total taken time } &=frac{x y}{x+y}=frac{20 times 30}{20+30}=frac{20 times 30}{50} &=12 mathrm{min} end{aligned} )
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