Mixed DI Level 2 Test 6

A tank has 3 taps. A and B to fill the tank and third tap making it empty. The 3rd tap is taking 120 minutes to empty the 75% of the tank. All the 3 taps are opened in the beginning. After 14 minutes, 3rd tap is closed. In how much time, will the rest of the tank be full?

 2 taps C and D are filling the tank while a 3rd tap can empty the full tank in 100 minutes. C and D are kept open for 20 minutes in the beginning and then 3rd tap is also opened. In what time is the tank emptied?

2 taps A and E are filling the tank respectively. There is a 3rd tap in the bottom of tank to empty it. If all the three taps are simultaneously opened, then the tank is full in 100 minutes. In how much time, the 3rd tap alone can empty the tank?

Two taps C and D can fill a tank and a waste tap can empty in 300 minutes. All the 3 taps working together can fill the tank in 300 minutes. The capacity of the tank is:

A large tanker can be filled by two taps B and C. How many minutes will it take to fill the tanker from empty state if B is used for half the time and C and B fill it together for the other half?