I believe the answer is b
It can sometimes be rational

The minutes cancel out leaving you with:

= 3.2 revs per second.
The wheel does
3.2 revolutions per second.
Algebra i am really bad at this so don't take my word for it i think maybe 20 SORRY IF WRONG
You thought right.
if 2 eggs make 15 servings then:
4 eggs make 30 servings and
6 eggs make 45 servings