Pipe A can fill an empty tank in 6 hours and pipe B in 8 hours. If both the pipes are opened and after 2 hours pipe. A is dosed, how much time B will take to fill the remaining tank
1). $7\frac{1}{2}$ hours
2). $2\frac{2}{5}$ hours
3). $2\frac{1}{3}$ hours
4). $3\frac{1}{3}$ hours
A pipe can fill a tank in x hours and another can empty it in, y hours. They can together fill it in (y > x)
1). $\frac{xy}{y-x}$hours
2). x-y hours
3). y-x hours
4). $\frac{xy}{x-y}$ hours
Two pipes A and B can separately fill a tank in 2 hours and 3 hours respectively. If both the pipes are opened simultaneously in the empty tank, then the tank will be filled in
1). 1 hour 12 minutes
2). 2 hours 30 minutes
3). 1 hour 15 minutes
4). 1 hour 20 minutes
Two pipes A and B can fill a tank in 36 minutes and 45 minutes respectively. Another pipe C can empty the tank in 30 minutes. First A and B are opened. After 7 minutes. C is also opened. The tank is filled up in
1). 39 minutes
2). 46 minutes
3). 40 minutes
4). 45 minutes
A water tank can be filled by a tap in 30 minutes and another tap can fill it in 60 minutes. If both the taps are kept open for 5 minutes and then the first tap is closed , how long will it take for the tank to be full
1). 20 minutes
2). 25 minutes
3). 30 minutes
4). 45 minutes