In the place where you copied the question from, were there also some choices to select the answer from ? Did you inadvertently neglect to include them with the question, or was that intentional, leaving us to pull an equation out of thin air ? Alternatively ... and incredibly ... did you just not realize that the list of equations printed right there next to the question or under it had anything to do with it ?
If Shelley completed a drive in 90 minutes, then
The distance = (90) x (her average speed on the trip, in miles per minute) or = (1.5) x (her average speed on the trip, in miles per hour) .
