Prove : Reason your statement please !

Carrie and krystal are taking a road trip from greenville each person has her own map carry in north valley or each person has her own map in the scales on the maps are different and carries map read about in northville are 4.5inches apart the scale on a map is 1 inch equals 20 miles how far is greenville from north valley

Which expression calculates the speed in meters per second of an object that travels a distance of 100 m every 20 seconds

I’m really confused and need your assist me with this question i’ve never been taught