Question

Time taken by (A+B+C) to all the cistern - 48 hours.
EXERCISE 13A
1. Rajan can do a piece of work in 24 days while Amit can do it in 30 days. In how many days
can they complete it, if they work together?
2. Ravi can do a piece of work in 15 hours while Raman can do it in 12 hours. How long will
both take to do it, worlding together?
3. A and B, working together can finish a piece of work in 6 days, while A alone can do it in
9 days. How much time will B alone take to finish it?
4. Two motor mechanics, Raju and Siraj, working together can overhaul a scooter in 6 hours
Raju alone can do the job in 15 hours. In how many hours can Siraj alone do it?
5. A, B and C can do a piece of work in 10 days, 12 days and 15 days respectively. How long
will they take to finish it if they work together?
6. A can do a piece of work in 24 hours while B alone can do it in 16 hours. If A, B and
working together can finish it in 8 hours, in how many hours can Calone finish the work?
7. A, B and C working together can finish a piece of work in 8 hours. A alone can do it
20 hours and B alone can do it in 24 hours. In how many hours will C alone do the sam
work?​

Answer 1

1) 7 days

2) 3 hours

3)15 days

4) 9 hours

5) 13 days

6) 20 hours

7) 12 hours