Time and Work Short Tricks Solved Problems for Competitive Exams

Practice Exercises: 

Q.1. If m men can do a work in r days, then the number of days taken by (m+n) men to do it is 

(A) (m+n)/mn

(B) (m+n)/mr

(C) mr/(m+n)

(D) (m+n)r/mn

Q.2. A can do a piece of work in 10 days, B can do it in 12 days and C can do it in 15 days. In how many days they can complete the work, working together?

(A) 6

(B) 4

(C) 5

(D) 10

Q.3. Tap A fills a tank in 10 h and tap B can fill it in 15 h. Both are opened simultaneously. Sometimes later tap B was closed, then it takes total 8 h to fill up the whole tank. After how many hours tap B was closed?

(A) 2

(B) 3

(C) 4

(D) 5

Q.4. Alen and Border can do a work individually in 21 days and 42 days, respectively. In how many days they can complete the work, working alternatively?

(A) 14

(B) 28

(C) 42

(D) 35

Q.5. A takes 6 days less than B to do a certain job and 2 days more than C. A and B together can do the work in the same time as C. In how many days B alone can do the complete work?

(A) 10

(B) 14

(C) 12

(D) 16

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