Question

If a alone does the work in 15 days, how much time will they take working together to complete the job, if a is 30 % more efficient than b?

Answer 1

Simple. 13 days.How?

Well here goes,

A is 30% more efficient than B : A + 0.3A =1.3A

Work done by A in one day: 1/23

Work done by B in one day: 1/(1.3*23) = 1/29.9

Work done by A+B in one day: 1/23 + 1/29.9 = 1/13

If both of them worked together, it would take them 13 days.