Maths by Lav Kumar

Two pipes can fill a cistern separately in 20 minutes and 40 minutes respectively and a waste pipe can drain off 35 gallons per minute. If all three pipes are opened, the cistern gets filled in an hour. What is the capacity of the cistern?

Two taps 'A' and 'B' can fill a water reservoir in 8 and 6 hours respectively, A third tap 'C' can empty the tank completely in 24 hours.How long would it take to fill the empty tank when all the taps are open?

Two taps can fill a tank in 15 and 12 minutes respectively. A third tap can empty it in 20 minutes. If all the taps are opened at the same time, then in how much time will the tank be filled? Easy

A cistern is normally filled in 5 hours. However, it takes 6 hours when there is leak in its bottom. If the cistern is full, in what time shall the leak empty it?