Question

Two pipes a and b can fill a tank in 16 hours and 12 hours respectively the capacity of the tank is 240 litres both the pipes are opened simultaneously and close after 2 hours how much more water is needed to fill the tank

Answer 1

Pipe A = 240/16 = 15 Ltr / Hr
Pipe B = 240/12 = 20 Ltr / Hr

So , 
If both pipes open for 2 Hrs at same time, 
(A x 2) + (B x 2) - 270 Ltr.
30 + 40 - 270 = 170 Ltr.

So 170 Ltrs of water more required to fill the tank.

Answer 2

Heya....

See above for the answer....

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