SOLUTION: Mike travels ti his friends house at 40miles/hour. He returns at 45 miles/hour.The total trip took 4 hours. How far away is his friend?

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Question 155362: Mike travels ti his friends house at 40miles/hour. He returns at 45 miles/hour.The total trip took 4 hours. How far away is his friend?
Answer by jojo14344(1513) About Me  (Show Source):
You can put this solution on YOUR website!
Remember:
Speed=distance%2Ftime
Given: Speed=45miles%2Fhour; time=4hours; d=unknown
Substituting;
45miles%2Fhour=d%2F4hours, cross multiply
d=%2845miles%2Fcross%28hour%29%29%284cross%28hours%29%29
d=180miles
Thank you,
Jojo