Julie leaves her house at 9:00 traveling at 15 mph. Her brother leaves 15 minutes later traveling at 30 mph going to the same location as Julie. They arrive at the same time. How far did each travel?

Answer 1

d = rt. Their distances are equal. Fifteen minutes is 1/4-hour.

15j = 30(j - 0.25)

15j = 30j - 7.5

-15j = -7.5

j = 0.5 miles

15(0.5) = 7.5 miles