A tank can be filled in 30 minutes. There is a leakage which can empty the tank in 90 minutes. Therefore, the tank will be filled in
A. 60 minutes
B. 45 minutes
C. 55 minutes
D. 50 minutes
Answer:B
A tank can be filled in 30 minutes. There is a leakage which can empty the tank in 90 minutes. Therefore, the tank will be filled in
A. 60 minutes B. 45 minutes C. 55 minutes D. 50 minutes