A Cistern is two fifth full Pipe A can fill a tank in 10 minutes and pipe B can empty it in 6 minute...........

Quantitative Aptitude ( CCS) Pipes&cistern

A Cistern is two-fifth full. Pipe A can fill a tank in 10 minutes and pipe B can empty it in 6 minutes. If both the pipes are open,how long will it take to empty or fill the tank completely?

5 minutes

4 minutes

6 minutes

8 minutes

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Explanation:

Answer & Explanation
Answer – C. 6 minutes
Explanation :
pipe B is faster than pipe A and so,the tank will be emptied.
part to be emptied = 2/5
part emptied by (A+B) in 1 minute= (1/6 – 1/10) = 1/15
1/15 : 2/5 :: 1: x
2/5 * 15 = 6 minutes.