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Two pipes A and B can fill a tank in 16 hrs and 12 hrs respectively. The capacity of the tank is 240 liters. Both the pipes are opened simultaneously and closed after 2 hrs. How much more water need to fill the tank?

Correct Answer: 170 lit

Explanation:

Given A alone can fill the tank of capacity 240 lit in 16 hrs.


=> A can fill in 1 hr = 240/16 = 15 lit


=> B alone can fill the tank of capacity 240 lit in 12 hrs.


=> B can fill in 1 hr = 240/12 = 20 lit


Now, (A + B) in 1 hr = 15 + 20 = 35 lit


But they are opened for 2 hrs


=> 2 x 35 = 70 lit rae filled


Remaining water to be filled in tank of 240 lit = 240 - 70 = 170 lit.


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