A pump can fill a tank with water in 2 hours. Because of a leak in the tank it was taking $2\frac{1}{3}$ hours to fill the tank.The leak can drain all the water off the tank in :
1). 8 hours
2). 7 hours
3). $4\frac{1}{3}$ hours
4). 14 hours
Three taps A, B and C can fill a tank in 12, 15 and 20 hours respectively. If A is open all the time and B and C are open for one hour each alternatively, the tank will be full in :
1). 6 hours
2). $6\frac{1}{2}$ hours
3). 7 hours
4). $7\frac{1}{2}$ hours
Three pipes A, B and C can fill a tank in 6 hours,9 hours and 12 hours respectively. B and C are opened for half an hour, then A is also opened. The time taken by the three pipes together to fill the remaining part of the tank is
1). 3 hours
2). 2 hours
3). $2\frac{1}{2}$ hours
4). $3\frac{1}{2}$ hours
There are two pumps to fill a tank with water.First pump can fill the empty tank in 8 hours, while the second in 10 hours. If both the pumps are opened at the same time and kept open for 4 hours, the part of tank that will be filled up is:
1). $\frac{9}{10}$
2). $\frac{1}{10}$
3). $\frac{2}{5}$
4). $\frac{1}{5}$
If $\frac{3}{5}$ th of a cistern is filled in 1 minute,the time needed to fill the rest is
1). 40 sec
2). 30 sec
3). 36 sec
4). 24 sec