Question

Pipe a fills in 10 min and pipe b fills in 15 min. If both the pipes are opened for 5 min and a closed. How much long will it take to fill the tank

Answer 1

Answer:1 minute

Explanation:

Pipe A and Pipe B will together fill 1/10 + 1/15 = 1/6 part in 1 minute

So it will take 6 minutes to fill the tank.

Both pipes opened and closed after 5 minutes i.e. 5/6 part of tank is already filled.

The remaining 1/6 part will be filled in 1 minute.