a) 2400 litters
b) 4500 litters
c) 1200 litters
d) 7200 litters
Answer: d
Explanation: Let the total capacity of the tank is 30 units.
The efficiency of Leakage(Pipe A) will be $$\frac{30}{10}$$ = 3
And the efficiency of the leakage (Pipe A) and another Pipe (B) which is filling the tank will be $$\frac{30}{15}$$ = 2
Pipe A is emptying at 3 units/hr and when filling pipe B started then the emptying rate will come down to 2 units/hr.
Filling Pipe B efficiency is 3 – 2 = 1unit/hr
Pipe B will be fill the tank in $$\frac{30}{1}$$ = 30 hrs
Filling rate of Pipe B per minute is 4 litter
Total Capacity of tank will be = (4 × 60) × 30 = 7200 litters
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