Question

Pipe A can fill a tank in 5 hours, pipe B in 10 hours and pipe C in 30 hours. If all the pipes are open, in how many hours will the tank be filled?

• A. 2
• B. 3
• C. 3.5
• D. 4

Answer 1

The correct option is B

3

Part filled by (A + B + C) in 1 hour = $(\frac{1}{5}+\frac{1}{10}+\frac{1}{30})$ = $\frac{1}{3}$

$\therefore$ All the three pipes together will fill the tank in 3 hours.