Where save the bookmarks? Please help

X can finish 25% of a work in a day. Y can do 12.5% of the same work in a day. In how many days, will both of them finish the work together?

Hai Subhankar,
You can find your saved bookmarks
Cat users:
https://cracku.in/cat/progress
Banking users:
https://cracku.in/banking/progress
SSC users:
https://cracku.in/ssc/progress
RRB users:
https://cracku.in/railways/progress