I'll repeat what I said before, similar to this:
"If I am at 30,000ft and wish to descend to 10,000ft at 2,500 feet per minute - how long will this take me to reach my new altitude?'
This is a generic question and not representative of what you'll find in the CTC Database, and please, do not delete my post again, thank you!
Furthermore, it's a PILAPT test - so Google around for preparation software, it does exist.