Question

A is thrice as good a workman as B and takes $10$ days less to do a piece of work than B takes. B alone can do the whole work in?

Answer 1

The ratio of times taken by A and B $=1:3$ Means B will take $3$ times which A will do in 1 time.

If the difference of time is $2$ days, B takes 3 days.

If difference of time is $10$ days B takes $\frac{3}{2}\times 10=15$ days