A) 8 min
B) \[13\frac{1}{3}\] min
C) 30 min
D) 38 min
Correct Answer: B
Solution :
According to the question the first pipe empty the tank in 40 min and the diameter of the second pipe is twice that of the first that means the second pipe will empty the tank in 20 min. Thus, both of the pipes will empty the tank in \[\frac{40\times 20}{40+20}\] \[=\frac{800}{60}=\frac{40}{3}\] \[=13\frac{1}{3}\,\min \]You need to login to perform this action.
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