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A. 6 min. to empty
B. 6 min. to full
C. 9 min. to empty
D. 9 min. to full

Explanation:

Clearly, 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
x = (2/5 * 1 * 15) = 6 min.
So, the tank will be emptied in 6 min.

Correct Answer: 6 min. to empty

Last Updated: February 08, 2020