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The tank is filled up to the mark shown when both taps are opened together. How much longer will it take to become full?

Class 8Leaks and Changing PipesDirect and Inverse Proportions

A4 h
B1 1/3 h
C9 h
D2 2/3 h

Step-by-Step Solution

Together the taps fill

\frac{1}{6} + \frac{1}{12} = \frac{1}{4}

of the tank per hour. Still empty:

1 - \frac{1}{3} = \frac{2}{3}

, so time

= \frac{2}{3} \times 4 = 2 \frac{2}{3}

h.

Answer: D) 2 2/3 h

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