Asked by Trying to make it in life

A private plane traveled from Seattle to a rugged wilderness at an average speed of 180 mph. The return trip speed s 225 mph. If the total travelling time was 7 hours, how far is Seattle from the wilderness
Answered by Fiona
Seattle to wilderness=180mph
wilderness to Seattle=225mph
225+180=405miles in 7 hrs
405/7=57.8571 mph
57.8571 miles
Answered by Steve
Not quite, Fiona. When you finally got an answer, you ought to have done just a sanity check. The average speed was somewhere near 200 mph, and the flew for 7 hours, a distance of 57 mile is ludicrous.

since time = distance/speed, and the total time was 7 hours, then we want to find the distance d such that

d/180 + d/225 = 7
d = 700 miles
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