SOLUTION: dick sets out on a hike. after walking for a while at 5 miles per hour, he discovers he has forgotten his lunch. a passing truck takes him home at 20 miles per hour. when he gets h

Question 1159578: dick sets out on a hike. after walking for a while at 5 miles per hour, he discovers he has forgotten his lunch. a passing truck takes him home at 20 miles per hour. when he gets home he finds that he has lost exactly 1 hour. how far had he walked?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
distance is speed * time=5 mph *x =20 mph (1-x), since the two times add up to 1 hour
5x=20-20x
25x=20
x=0.8 hours which at 5 mph is 4 miles
trip back takes 0.2 hours which at 20 mph is 4 miles.
He walked 4 miles
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