# A and B can together complete a task in 18 hours. After 6 hours A leav

| A and B can together complete a task in 18 hours. After 6 hours A leaves. B takes 36 hours to finish rest of the task. How many hours would A have taken to do the task if he worked alone?

A. 54

B. 45

C. 21

D. 27

### Right Answer is: D

#### SOLUTION

From M_{1} × D_{1} = M_{2} × D_{2}

(A + B) × 18 = (A + B) × 6 + 36 B

A/B = 2/1

Total work = (2 + 1) ×18 = 54 unit

Required time taken by A = 54/2 = 27 days.

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A and B can together complete a task in 18 hours. After 6 hours A leav