A. 4.5 hrs
B. 5 hrs
C. 6.5 hrs
D. 7.2 hrs
Explanation:
Net part filled in 1 hour = (1/4 – 1/9) = 5/36
The cistern will be filled in 36/5 hrs i.e., 7.2 hrs.
Correct Answer: 7.2 hrs ✔
Last Updated: February 08, 2020
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