Freshers India

A pump can fill a tank with water in 2 hours. Because of a leak, it took 2(1/3) hours to fill the tank. The leak can drain all the water of the tank in:                        

Two pipes A and B can fill a tank in 60 minutes. If pipe A alone can fill it in 75 minutes. How much time will the pipe B take to fill the tank alone?                        

Three pipes A, B and C can fill a tank in 30 hours, 20 hours and 10 hours respectively. If all the pipes open together how much time is required to make the tank full?                        

Three pipes A, B and C together can fill a tank in 15 minutes. One of the pipes can fill it in 45 minutes and another in 30 minutes. How much time is taken by the third pipe alone to make the tank full?                         

If A can do a work in 10 days, B can do it in 20 days and C in 30 days in how many days will the three together do it?                        

An electric pump can fill a tank in 3 hours. Because of a leak in the tank, it took 3 hours 30 min to fill the tank. The leak can drain out all the water of the tank in :. [Assistant Grade]