If a female has the menstrual cycle of 34 days what is the date of ovulation.
17 day
14 day
20 day
5 day
A can do a piece of work in 25 days, which B alone can do in 20 days. A started the work and was joined by B after 10 days. The work lasted for(a) 1212 days(b) 15 days(c) 1623 days(d) 14 days