Question:
Two pipes A & B would be fill a tank in 20 & 30 minutes respectively. Both pipes being oppen, find when A must be turned off so that the tank may be just filled in 15 minutes.
After 10 minutes | |
After 20 minutes | |
After 15 minutes | |
None | |
After 10 minutes |
Answer:
After 10 minutes
Last Updated:
08/11/2021 - 03:30