Question

A and B together can do a piece of work in 35 days,, While A alone can do it in 60 days,, ​

Answer 1

Answer:

B alone can finish a piece of work in 84 days

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

Efficiency (Work done per day) for :

• A & B together = 1/35th
• A alone = 1/60th

Thus, efficiency of B alone = Total - A’s efficiency

OR Efficiency of B alone = (1/35) - (1/60) = 6/210 - 3.5/210 = 2.5/210 = 1/84th

Hence, since B completes 1/84th work daily, he would take 84 days to complete the work alone.

(or)

Let B- can complete the work alone in X- days.

So 1/60 + 1/X= 1/35

1/X= 1/35–1/60 =

=1/X= (12–7)/420 = 5/420= 1/84

So B- alone can complete the work in= 84- days.