Question

A filling pipe can fill a pot in 40 minutes and wastage pipe can empty the filled pot in 60 minutes. By mistake without closing the wastage pipe, the filling pipe opened. In how much time an empty pot can be filled?

• A. 52
• B. 64
• C. 110
• D. 120

Answer 1

Answer:

D. 120

Solution:

Given:

A filling pipe can fill a pot in 40 minutes and wastage pipe can empty the filled pot in 60 minutes

Concept:

If a tap can fill a tank in x hours, then the tank filled by the tap in 1 hour = 1/x of the total tank.

Calculation:

Part of the pot filled in 1 minutes by both the taps

$=\frac{1}{40}-\frac{1}{60}=\frac{3-2}{120}=\frac{1}{120}$

Empty pot can be filled in 120 minutes.