For how many days sperms can remain alive in female reproductive system?
6-9 days
1-3 days
3-6 days
9-12 days
A can do a piece of work in 20 days which B alone can do in 12 days. Both started working together, B worked at it for 9 days. A can finish the remaining work in
(a) 3 days
(b) 5 days
(c) 7 days
(d) 11 days
Rahul can do 2/7 of a certain work in 6 days while Suresh can do 3/5 of the same work in 9 days. They started work together but after 7 days Tahul left the work. Find in how many days Suresh can complete the remaining work?