Two pipes, P and Q, together can fill a cistern in 20 minutes and P alone can in 30 minutes. Then Q alone can fin the cistern in
1). 62 minutes
2). 60 minutes
3). 61 minutes
4). 51 minutes
A tank can be filled by pipe A in 2 hours and pipe B in 6 hours. At 10 A.M. pipe A was opened. At what time will the tank be filled If pipe B is opened at 11 A.M.
1). 12.45 A.M
2). 5 P.M
3). 11.45 A.M
4). 12 P.M
One tap can fill a water tank in 40 minutes and another tap can make the filled tank empty in 60 minutes. If both the taps are open. in how many hours will the empty tank be filled
1). 2 hours
2). 2.5 hours
3). 3 hours
4). 3.5 hours
Three taps A,B and C together can fill an empty cistern in 10 minutes.The tap A alone can fill it in 30 minutes and the tap B alone in 40 minutes. How long will the tap C alone take to fill it
1). 16 minutes
2). 24 minutes
3). 32 minutes
4). 40 minutes
Two pipes can fill a cistern separately in 10 hours and 15 hours. They can together fill the cistern in
1). 6 hours
2). 7 hours
3). 8 hours
4). 9 hours