A can do a piece of work in 70 days and B is 40% more efficient

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A can do a piece of work in 70 days and B is 40% more efficient than A. The number of days taken by B to do the same work is

A : B = D₂ : D₂
⇒ 100 : 140 = D₂ : 70
⇒ 100 × 70 = 140 × D₂

⇒ D₂ =	100 × 70	= 50 days.
	140

Aliter : Using Rule 17,
Here, x = 70, r = 40%
Time taken by B

= x ×	100
	100 + R

=	70 × 100	= 50 days
	100 + 40