A can do a work in 21 days. B is 40 more efficient than
a. The number of days required for b to finish the same work alone is
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since A takes more time than B .
ratio of time taken by them
= 140 : 100 = 7 : 5
let constant ratio = x
time taken by A = 7x days
and time taken by B = 5x days
since, A takes = 21 days
7x = 21 => x = 3
B will finish the work in = 5x = 5 × 3 = 15 days
Answer: 15 days
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