A cistern is provided with two pipes A and B. A can fill it in 20 minutes and B can empty it in 30 minutes. If A and B be kept open alternately for one minute each, how soon will the cistern be filled
1). 121 minutes
2). 110 minutes
3). 115 minutes
4). 120 minutes
Two pipes X and Y can fill a cistern in 24 minutes and 32 minutes respectively. If both the pipes are opened together, then after how much time (in minutes) should Y be closed so that the tank is full in 18 minutes
1). 10
2). 8
3). 6
4). 5
If two pipes function simultaneously. a tank is filled in 12 hours. One pipe fills the tank 10 hours faster than the other. How many hours does the faster pipe alone take to fill the tank
1). 20 hrs
2). 18 hrs
3). 15 hrs
4). 12 hrs
Three taps A. B. C can fill an overhead tank in 4, 6 and 12 hours respectively. How long would the three taps take to fill the tank If all of them are opened together
1). 2 hrs.
2). 4 hrs.
3). 3 hrs.
4). 5 hrs.
Two pipes A and B can fill a cistern in 3 hours and 5 hours respectively. Pipe C can empty in 2 hours. If all the three pipes are open, in how many hours the cistern will be full
1). can't be filled
2). 10 hours
3). 15 hours
4). 30 hours