Q.1 to Q.5 - EXERCISE 13B - Objective Questions - Time and Work

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Издатель Oct 5, 2020

1. A alone can do a piece of work in 10 days and B alone can do it in 15 days. In how many days will A and B together do the same work?
(a) 5 days
(b) 6 days
(c) 8 days
(d) 9 days
2. A man can do a piece of work in 5 days. He and his son working together can finish it in 3 days. In how many days can the son do it alone?
(a) 6 1/2 days
(b) 7 days
(c) 7 1/2 days
(d) 8 days
3. A can do a job in 16 days and B can do the same job in 12 days. With the help of C, they finish the job in 6 days only. Then, C alone can finish it in
(a) 34 days
(b) 22 days
(c) 36 days
(d) 48 days
4. To complete a work, A takes 50% more time than B. If together they take 18 days to complete the work, how much time shall B take to do it?
(a) 30 days
(b) 35 days
(c) 40 days
(d) 45 days
5. A works 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
R S Aggarwal Chapter 13 time and work Class 8 math solutions