If 6 oil tankers can be filled by a pipe in`4 1/2` hours, how long does the pipe take to fill 4 such oil tankers?

10 pipes of the same diameter can fill a tank in 24 minutes.If 2 pipes gp out of order.how long will the remaining pipe take to fill the tank?

A cistern can be filled by a tap in 6hours and emptied by an outlet pipe in 8 hours.How long will it take to fill the cistern if both the tap and the pipe are opened together?

If two pipes function together, the tank will be filled in 12 h. One pipe fills the tank in 10 h faster than the other. How many hours does the faster pipe take to fill up the tank?

If two pipes are put in operation simultaneously, the tank is filled in 24 min. One pipe fills the tank in 20 min faster than the other. How many hours does the faster pipe take to fill the tank?

To fill the tank Pipe A and Pipe B takes 12hours. Pipe B and Pipe C takes 9 hours to fill the tank and Pipe C and Pipe A together take 15 hours to fill the tank. Find the time taken to fill the tank when Pipe A, Pipe B and Pipe C opened together(approximately).