1. A tank has 2 inlets A and B which take 24 hrs to fill the tank when they are opened simultaneously and function together. If Afills the tank twice as fast as B fills the tank, how much time will A alone take to fill the tank independently?
A) 36 hours B) 38 hours C) 28 hours D) 42 hours E) 30 hours
2. Pipe K can fill the tank in 20 hrs and pipe R can fill it in 40 hrs. If both pipes are opened simultaneously and Pipe R is closed after 8 hours. Find the time taken by pipe K alone to fill the remaining tank?
A) 16 B) 8 C) 24 D) 10 E) 9
3. Two pipes A and B can fill a tank in 8 hrs when opened simultaneously. If B alone takes five hours more than A alone takes to fill the tank completely, how much time does A alone take to fill the tank?
A) 12 hrs. B) 18 hrs. C) 14 hrs. D) 15 hrs. E) 10 hrs.
4. Pipe A and pipe B together can fill half of a tank in 7 hours, while pipe C can empty 40% of the same tank x hours. When all three pipes open together in the same empty tank, then it completely filled in 26 hours. Find the value of x?
A) 12 B) 14 C) 10 D) 8 E) 18
5. Two pipes A and B can fill a tank in 360 min and 480 min respectively. If they are turned on alternately for 60min each starting with B, what amount of time taken by them to fill the tank?
A) 6.75 hrs B) 7 hrs C) 4 hrs D) 3.75hrs E) 13hrs
6. A and B can fill the tank in 12 hours and 16 hours respectively, then find how many hours can fill the tank if both of them fill the tank with twice the original efficiencies?
A) 7 B) 5 C) 8 D) 4 E) 3
7. Three pipes A and B can fill the tank in 16 minutes and 48 minutes respectively. Another pipe C alone can empty thewhole tank in 24 minutes. Initially pipes A and B were opened together for 5 minutes, then Pipe C was also opened, then find how many minutes will they take to fill the tank?
A) 15 B) 14 C) 19 D) 13 E) 16
8. Pipes A and B can fill the tank in 12 hours and 20 hours and Pipe C can empty the same tank in 15 hours. If a tank is 7/15 th filled, then find the time to fill the remaining tank if three pipes are opened?
A) 22 B) 15 C) 7 D) 8 E) 4
9. Pipe X and Y alone can fill a tank in 25 minutes and 30 minutes, respectively Pipe Z can empty the tank in 50 minutes. Pipe X and Y opened from the beginning and after 10 minutes pipe Z was also opened. In how much time tank will be filled?
A) 13 mins B) 12 mins C) 15 mins D) 5 mins E) 10 mins
10. Two pipes A and B can fill together a tank in 16 minutes and 14 minutes respectively. If both pipes are opened together and after 4 minutes pipe A is closed, find the total time in which the tank will be filled?
11. Two pipes M and N can fill the tank in 42 min and 70 min respectively and X can empty the tank in 30 min. If all three pipes are opened together, how much time will it take to empty or fill the tank? (In hrs)
A) 3.5 hrs B) 1.5 hrs C) 1 hr D) 1.75 hrs E) 2 hrs
Key
1-A ; 2-B ; 3-D ; 4-A ; 5-B ; 6-E ; 7-C ; 8-D ; 9-C ; 10-A ; 11-A
