6 pipes are required to fill a tank in 1 hour 20 minutes. How long will it take if only 5 pipes of the same type are used?

6 pumps are required to fill a tank in1 hour 20 minutes. How long will it take if only 5 pumps of the same type are used?

6 pipes can fill a tank in 1 hour 24 minutes. How long will it take to fill the tank if 7 pipes of the same type are used?

8pumps to to fill a tank in 1hour 30minutes. How long will it take,if only 6pumps?

12 pipes, all of the same size, fill a tank in 42 minutes. How long will it take to fill the same tank,if 21 pipes of the same size are used ?

5 pumps are required to fill a tank in 1 1/2 hours. How many pumps of the same type are used to fill the tank in half an hour.

6 pipes fill tank in 120 minutes, then 5 pipes will it in

A tank can be filled by 5 pipes in 80 minutes. How long it will take to fill the tank by 8 pipes of same size?