Question

There are 3 taps A, B and C in a tank. These can fill the tank in 10 hours, 20 hours and 25 hours, respectively. At first all three taps are opened simultaneously. After 2 hours , tap C is closed and A and B keep running. After 4 hours from the beginning, tap B is also closed. The remaining tanks is filled by tap A alone. Find the percentage of work done by tap A itself .

• A. 50%
• B. 75%
• C. 32%
• D. 72%

Answer 1

Answer: (D)