This is an SAT prep question. A woman drove to work at an average speed of 40 miles per hour and returned along the same route at 30 miles per hour. If her total traveling time was 1 hour, what was the total number of miles in the round trip?

Answer 1

how do you draw a oblique discrete line

Answer 2

clearly the distance(D)each way is the same

so D/40 + D/30 + 1

solve for D

Answer 3

80