# A is thrice as productive as C. Together they can complete a job in

| A is thrice as productive as C. Together they can complete a job in 22.5 days. If B joins them after they have worked for 15 days then in how many days canthey finish the rest of the job if B alone can do the job in 15 days?

A. 6

B. 3

C. 9

D. 2

### Right Answer is: B

#### SOLUTION

A : C

Eff. 3 : 1

Total work = 90 unit

According to question B alone can finish the work in 15 days.

So, the efficiency of B = 90/15 = 6 unit/day

Work done by A & C in 15 days = 4×15 = 60 unit

Remaining Work = 90 – 60 = 30 unit

One day efficiency of (A + B + C) = 3 + 1 + 6 = 10 unit

Required remaining days = 30/10 = 3 days.

Share

A is thrice as productive as C. Together they can complete a job in