(a) 8 hrs 15 min (b) 3 hrs 45 min (c) 4 hrs (d) 4 hrs 15 min

2. Two pipes can fill a tank in 10 hours and 12 hours respectively, while a third pipe empties the full tank m 20 hours. If all the three pipes operate simultaneously, in how much time will the tank be full?

(a) 7 hrs 15 mm (b) 7 hrs 30 mm (c) 7 hrs 45 mm (d) 8 hrs

3.One tap can fill a water tank four times as fast as another tap. If together the two taps can fill the water tank in 30 minutes then the slower tap alone will be able to fill the water tank in ----------------

(a) 81 min (b) 108 min (c) 150 min (d) 192 min

4.A can do a piece of work in 15 days .B is 50% more efficient than A. Then B can finish it in

(a)10 days (b) 7 1 /2 days (c) 12 days (d) 101/2 days

5. A does 20% less work than B. If A can finish a piece of work in 7 1 /2 hrs..Then B can finish it in

(a) 5 hrs (b) 51 /2 hrs (c) 6 hrs (d) 61 /2 hrs

6.A work twice as fast as B. If both of them can together finish a piece of work in 12 days ,then b alone can do it in ?

(a) 24 days (b) 27 days (c) 36 days (d) 48 days

7. A take 50% more time B to complete a work. If together they takes 18 days to finish it . How much time shall b take to do it alone? (a) 30 days (b) 35 days (c) 40 days (d) 45 days

8.Sumit is twice as good workman as Amit. Sumit finished a piece of work in 3 hours less than Amit. In how many hours could they have finished that piece of work working together?

a] 2 .5 hr. b] 4 hr. c] 2 hr. d] 6 hr.

9. A can do a work in 9 days. If B is 50% more efficient to A, then in how many days can B do the same work?

a] 13.5 b] 4.5 c] 6 d] 3

10. Some persons can do a piece of work in 12 days. Two times the number of such persons will do half of that work in.

a] 6 days b] 4 days c] 12 days d] 3 days

**Answers:**

**1. (a) 2. (b) 3. (c) 4.(a) 5.(c)**

6. (d) 7. (a) 8. (c) 9. c 10.(d)

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