Three pipe two inlets of tank R and pipe A can fill a tank If Pipe A alone can fill a tank in 20 min...........

Quantitative Aptitude ( CCS) Pipes&cistern

Study the following graph carefully to answer the given questions
Time taken by pipes to fill tanks in minutes

Three pipe, two inlets of tank R and pipe A can fill a tank. If Pipe A alone can fill a tank in 20 minutes and the pipe A is closed 8 minutes before the tank is filled. In what aproximate time the tank is full?

8 minutes

9 minutes

10 minutes

11 minutes

12 minutes

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Explanation:

Work of all pipes = (1/25 + 1/15 + 1/20)
Work of inlet pipes of tank R = 1/25 + 1/15
Let T is the time taken by the pipes to fill the tank
(1/25 + 1/15 + 1/20) × (T – 8) + (1/25 + 1/15) × 8 = 1
T = 8.93 min= 9 min approx.

Hence option 2 is correct