6.  Two pipes A and B can separately fill a tank in 10 and 15 minutes respectively. A third pipe C can drain off 30 liters of water per minute. If all the pipes are opened, the tank can be filled in 10 minutes. What is the capacity of the tank?

500 liters
370 liters
450 liters
320 liters

```Answer

Answer: Option  C Explanation:1/10+1/15-1/x = 1/10
X= 15
15*30 = 450 liters ```

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7.  A pipe can fill a tank in 5 hours, but due to a leakage it took 7 hours to fill the tank. If the tank is full, in what time will tank become empty due to leakage?

15.30 hrs
17.50 hrs
16 hrs
12.30 hrs

```Answer

Answer: Option  B Explanation:1/5 - 1/7 = 7 - 5/35 = 2/35 = 1/ 17.5
= 17.50 hours ```

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8.  A cistern can be filled by a tap in 4 hours while it can be emptied another tab in 7 hours. If both the taps are opened simultaneously, then after how much time will the cistern get filled?

9 hrs
9.20 hrs
9.30 hrs
9.33 hrs

```Answer

Answer: Option  D Explanation:1/4 - 1/7 = 7-4/28
cistern filled in = 28/3 =9.33 hrs. ```

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9.  A tap can fill a tank completely in 6 hours. After half the tank is filled, one more similar tap is opened. What is the total time taken to fill the tank completely?

4 hrs 20 min
3 hrs 30 min
3 hrs 10 min
4 hrs 30 min

```Answer

Answer: Option  D Explanation:Tab fill the half tank in 3 hrs.
Now another similar tab opened.
1/6 +1/6 = 2/6 = 1/3.
Remaining half tank filled in 1.5 hrs.
Total time = 3 + 1.5 = 4 hour 30 minute. ```

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10.  Two pipes A and B can fill a tank in 4 hours and 5 hours respectively. if they are opened an alternate hours and if pipe B is opened first, in how many hours, the tank fill in

4.30 hours
5 houre
7 hours
6 hours

```Answer

Answer: Option  A Explanation:A+B = 1/4 = 1/5 = 9/20...........2 hours
A+B = 18/20...........................4 hours
= 9/10
Remaining = 1- 9/10 = 1/10.....it take 1/2 hour => B
Already 4+ Remaining 2(B) =4 + 1/2 = 4.30 hours. ```

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