Question
Susan drove to her mother's house at an average speed of 36 miles per hour. The trip there took a half hour. If it took her 20 minutes to return, what was her average speed, in miles per hour, coming home?(1) 40(2) 46(3) 50(4) 54
Step 1
Since we know that she drove for a half hour (0.5 hours) at an average speed of 36 miles per hour, we can use the formula for distance, which is: Distance = Speed Ă— Time So, the distance to her mother's house is: Distance = 36 miles per hour Ă— 0.5 hours = 18 Show more…
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