SOLUTION: A boy cycles from his house to a friend's house at 20km per hour and home again at 25km per hour. If his round trip takes 9/10 of an hour, how far is it to his friend's house?

Question 520641: A boy cycles from his house to a friend's house at 20km per hour and home again at 25km per hour. If his round trip takes 9/10 of an hour, how far is it to his friend's house?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
A boy cycles from his house to a friend's house at 20km per hour and home again at 25km per hour.
If his round trip takes 9/10 of an hour, how far is it to his friend's house?
:
Let d = the one-way distance to friends house
;
Write a time equation, time = dist/speed
+ = .9
Multiply by 100 to clear the denominators, solve for d
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