Question

A tank of capacity 60 litres can be filled in 10 minutes by a pipe P. Another pipe Q placed at the bottom of tank can empty the tank in 30 minutes. Both of the pipes were opened. In how much time pipe Q will empty the tank if pipe P is closed after 10 minutes?

CAT 2021

A
11 minutes
CORRECT ANSWER WRONG ANSWER
B
12 minutes
CORRECT ANSWER WRONG ANSWER
C
13 minutes
CORRECT ANSWER WRONG ANSWER
D
9 minutes
CORRECT ANSWER WRONG ANSWER
Solution

Correct option is (C)

(C)