Question



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?
how do you draw a oblique discrete line
clearly the distance(D)each way is the same

so D/40 + D/30 + 1

solve for D
80

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