Question

two English pipes a and b can fill an Empty cistern in 4 hours and 8 hours respectively if both are opened together in the empty cistern how much time will it take to fill it completely​

Answer 1

Answer:

$capacity \: of \: pipe \: a = 4hour \\ capacity \: of \: pipe \: b = 8 \: hour \\ then \: capacity \: of \: cistern \: \: \: \: is \: 8 \\ \\ \\ then \: 8 \div 3 = 2 \times \frac{2}{3} \: answer$

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