Question

Two pipes A and B can fill a tank in 20 minutes and 30 minutes respectively. If both pipes are opened together, the time taken to fill the tank is:
A. 15 minutes
B. 25 minutes
C. 50 minutes
D. 12 minutes

Answer 1

Answer:

Step-by-step explanation:

A can fill the tank in 20min=1/20th work it can do

B can fill the tank in 30 min=1/30th work

both opened together

(1/20)+(1/30)=50/600=1/12

12 min to fill the tank