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A tank is filled in 2 hours 24 minutes by two pipes working together. If one pipe alone takes 4 hours, how long does the other take alone?

Competition practicePipes & Cisterns

A3.2 h
B1 h 36 min
C6 h
D1.6 h

Step-by-Step Solution

2 h 24 min

= 2.4

h.

\frac{1}{2.4} - \frac{1}{4} = \frac{5}{12} - \frac{3}{12} = \frac{1}{6}

→ 6 h. (1 h 36 min is 4 h − 2 h 24 min.)

Answer: C) 6 h

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