A) 8 minutes
B) 7 minutes
C) 10 minutes
D) 15 minutes
Correct Answer: A
Solution :
Part of the tank filled in 1 minute \[=\frac{1}{10}+\frac{1}{20}-\frac{1}{40}\] \[=\frac{4+2-1}{40}=\frac{5}{40}=\frac{1}{8}\] \[\therefore \] Hence, the tank will be filled in 8 minutes.You need to login to perform this action.
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