A map shows a section of Interstate 94 that forms a straight line. A family plans to drive 72 miles on Interstate 94 from St Paul, MN to Elk Mound, WI. They drive for 20 miles, and then decide they will stop halfway through their trip to eat. How much farther do they need to drive before they stop for dinner?

16 miles

Step-by-step explanation:

Given that:

Total distance of the trip = 72 miles

They have decided to stop half way their trip i.e. they will stop at a distance miles from the starting point.

Also, given that they have already traveled for 20 miles.

To find:

How much farther do they need to drive before they stop for dinner?

Solution:

Distance already covered = 20 miles

Distance to be covered before stopping for dinner = 36 miles

Distance to be covered more = Total distance to be covered before stopping - Distance already covered

i think the answer is b