A) 72
B) 84
C) 108
D) 120
Correct Answer: D
Solution :
Part of the cistern filled in 1 min by both the taps \[=\frac{1}{40}-\frac{1}{60}=\frac{3-2}{120}=\frac{1}{120}\] \[\therefore \] Empty cistern will be filled in 120 min.You need to login to perform this action.
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