1

Question

Pipe A can fill a tank in 12 hours and pipe B can empty the tank in 18 hours. Both the pipes are opened at 6 A.M. and after some time, pipe B is closed. The tank is full at 8 P.M.

What was the time at which pipe B was closed?

Open in App

Solution

The correct option is **A**

The tank was full in 14 hours → Pipe A worked for complete 14 hours.

Let pipe B worked for x hours.

∴ 1412−x18=1

x=3 hours

Hence, pipe B was closed at 9 A.M.

9 AM

The tank was full in 14 hours → Pipe A worked for complete 14 hours.

Let pipe B worked for x hours.

∴ 1412−x18=1

x=3 hours

Hence, pipe B was closed at 9 A.M.

35

View More

Join BYJU'S Learning Program

Join BYJU'S Learning Program