If `4/5` of a clstern is filled in 1 minute,how much time will be required to fill the empty cistern?

If 4/5 of a cistern is filled in 1 minute,how much time will be required to fill the empty cistern?

If 3/ 5^"th" of a cistern is filled in 1 minute, how much more time will be required to fill the of it?

If 3/5 th oif a cistern is filled in 30 minutes, how much more time will be required to fill the rest of it?

If (4)/(5) of a water tank is filled in 1 hour,how much time will be required to fill the rest of it? 20 minutes (b) 15 minutes 12 minutes (d) 10 minutes

If 4/5 of a water tank is filled in 1 hour, how much time will be required to fill the rest of it? (a)20 minutes (b) 15 minutes (c)12 minutes (d) 10 minutes

Two pipes A and B can fill a cistern in 24 minutes and 30 minutes, respectively. There is also an outlet C. If all the three pipes are opened together, the cistern is filled in 20 minutes. How much time will be taken by C to empty the full cistern?

Two pipe A and B can separately fill a cistern in 60 minutes and 75 minutes respectively . There is a third pipe at the bottom of the cistern to empty it, if all the three pipes are simultaneously opened, then the cistern is filled in 50 minutes . In how much time can the third pipe alone empty the cistern ?