skip to main content




Puzzle ZHRT 



??

A large fresh water reservoir has two types of drainage system: small pipes and large pipes.

6 large pipes, on their own, can drain the reservoir in 12 hours.

3 large pipes and 9 small pipes, at the same time, can drain the reservoir in 8 hours.

How long will 5 small pipes, on their own, take to drain the reservoir?

Puzzle Copyright © Kevin Stone

workings hide hint answer print

Share Link — www.brainbashers.com/puzzle/zhrt

Hint
What would happen in 24 hours?

 

Note: BrainBashers has a Dark Mode setting.