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Two pipes feed a water tank at the rate of 2 liters/minute and and 3 liters/minute. A third pipe draws out water at a rate of 6 liters/minute. The capacity of the tank is 100 liters and it is full of water. How many minutes would it take to make the tank empty if the three pipes are opened simultaneously?

Two pipes feed a water tank at the rate of 2 liters/minute and and 3 liters/minute. A third pipe draws out water at a rate of 6 liters/minute. The capacity of the tank is 100 liters and it is full of water. How many minutes would it take to make the tank empty if the three pipes are opened simultaneously? Correct Answer 100

First pipe feed the water tank in 1 min = 2 liters

Second pipe feed the water tank in 1 min = 3 liters

Third pipe draws out water in 1 min = 6 liters

If all three pipes open simultaneously, then water draws out in 1 min = 6 – 3 – 2 = 1 liter

Capacity of tank = 100 liters

It would take to make the tank empty if the three pipes are opened simultaneously = 100/1 = 100 min

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