A tank has two pipes. The first pipe can fill it in 4 hours and the second can e

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A tank has two pipes. The first pipe can fill it in 4 hours and the second can empty it in 16 hours. If two pipes be opened together at a time, then the tank will be filled in

Options:

A . 5$1/3$ hours

B . 6 hours

C . 5$1/2$ hours

D . 10 hours

Answer: Option A
Answer: (a)Using Rule 7,Part of tank filled by both the pipes in 1 hour= $1/4 - 1/16 = {4 - 1}/16 = 3/16$Required time = $16/3 = 5{1}/3$ hours

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