A. 12
B. 13
C. 11
D. 10
Explanation:
Part of the filled by all the three pipes in one minute
= 1/18 + 1/15 – 1/45 = (5 + 6 – 2)/90 = 9/90 = 1/10
So, the tank becomes full in 10 minutes.
Correct Answer: 10 ✔
Last Updated: February 08, 2020
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