Pipe and Cistern

## Questions Asked from this Chapter:

### Question Type 1: Based on basic concept of Pipe & Cistern

**Example:**

Two pipes can fill a cistern in 3 hours and 4 hours respectively and a waste pipe can empty it in 2 hours. If all the three pipes are kept open, the cistern will be filled in:

a) 5 hours

b) 8 hours

c) 10 hours

d) 12 hours

**Solution:**

### Question Type 2: Based on Fractions/ Part of Filled Tank

**Example:**

Pipes P & Q can fill a tank in 10 & 12 hours respectively and C can empty in 6 hours. If all the three are opened at 7:00 am. At what time will one-forth of the tank be filled?

a) 10 am

b) 10 pm

c) 11 pm

d) 11 am

**Solution:**

### Question Type 3: Based on taps are opened alternatively or a leak in a Tank

**Example:**

A tank can be filled with water by two pipes A and B together in 36 minutes. If the pipe B was stopped after 30 minutes, the tank is filled in 40 minutes. The pipe B can alone fill the tank in:

a) 45 minutes

b) 60 minutes

c) 75 minutes

d) 90 minutes

**Solution:**

**Example:**

Two pipes A and B can fill a tank in 6 hours and 8 hours respectively. If both the pipes are opened together , then after how many hours should B be closed so that the tank is full in 4 hours?

a) 2/3

b) 1

c) 2

d) 8/3

**Solution:**