1/30 + 1/40 = 7/120
120/7 = 17 1/7 days
Ravi can do a piece of work in 30 days while Prakash can do it in 40 days. In how many days will they finish it together?
Options:
- 17 1/7 days
- 27 1/7 days
- 23 2/7 days
- 16 4/11 days
- none of these