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in Aptitude by (79.8k points)

A can do three times the work done by B in one day. They together finish 2/5 of the work in 9 days, The number of days by which B can do the work alone are :. 

(a) 120 days 

(b) 100 days 

(c) 30 days 

(d) 90 days

1 Answer

+1 vote
by (71.7k points)
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Best answer

Correct option (d) 90 days

Explanation: 

eff. Of A = 3 efficiency of B

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