Ratio of rates of working of A and B = 2 : 1.
So, ratio of times taken = 1 : 2.
| B's 1 day's work = |
1 |
. |
| 12 |
| ∴ A's 1 day's work = |
1 |
; (2 times of B's work) |
| 6 |
| (A + B)'s 1 day's work = |
❨ |
1 |
+ |
1 |
❩ |
= |
3 |
= |
1 |
. |
| 6 |
12 |
12 |
4 |
So, A and B together can finish the work in 4 days.
