Question

A drum can be filled in 40 minutes with a filling pipe. Another emptying pipe can empty the entire drum in 60 minutes. When 2/3 parts of the drum was filled with oil, the emptying pipe was opened and closed after 15 minutes. If the pipe filling this time, then it will be time to fill the drum

Answer 1

Drum will be filled in 35minutes

Answer 2

Answer:

Step-by-step explanation: