If you drive at an average speed of 45 mph, you arrive I minutes early. if you drive an at an average speed of 40 mph and arrive I minutes late. how far is your house from the school.

This means that right in the middle of the 2 speeds is perfect speed (42.5 mph). That also means that you go 2.5 miles per minute.

42.5/2.5 = 85/5 = 17

17 minutes to travel 42.5 mph for x distance.

42.5/60 = 60/17

42.5/1 = 1/17

42.5/17

2.5

Your house is 25 miles away from your school.

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