two pipes a and b can fill a tank in 20 and 30 minutes respectively. if both the pipes are used together, then how long will it take to fill the tank?
two pipes a and b can fill a tank in 20 and 30 minutes respectively. if both the pipes are used together, then how long will it take to fill the tank?
Answer: Let’s assume the capacity of the tank is 1 unit (it could be any other value as well, the result will be the same).
Pipe A can fill 1/20th of the tank in one minute.
Pipe B can fill 1/30th of the tank in one minute.
If both pipes are used together, they can fill 1/20 + 1/30 = 1/12th of the tank in one minute (by adding their individual rates of filling).
Therefore, if both pipes are used together, it will take 12 minutes to fill the tank completely (since they can fill 1/12th of the tank in one minute).
Hence, the answer is that it will take 12 minutes to fill the tank if both pipes A and B are used together.