2018 · Q32
‘A’ is thrice as good a workman as ‘B’ and takes 10 days less to do a piece of work than ‘B’ takes. The number of days taken by ‘B’ alone to finish the work is
Elementary MathematicsTime and Work
- A12
- B15
- C20
- D30
Explanation
A is thrice as efficient as B, so their times are in the ratio 1:3. If B takes x days, 3x - x = 10 gives x = 5, so B alone takes 3 x 5 = 15 days. Hence option B.