SOLUTION: suppose you are traveling 70 miles per hour and still have 120 miles until your destination. now suppose someone you know passes you and know they are going to your same destinatio

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Question 943247: suppose you are traveling 70 miles per hour and still have 120 miles until your destination. now suppose someone you know passes you and know they are going to your same destination. how many miles per hour would the passing car be traveling to get to the destination 20 mins sooner than you?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+t%5B1%5D+=+120+%2F+r%5B1%5D+
+t%5B1%5D+=+120+%2F+70+
+t%5B1%5D+=+12%2F7+ hr
This is the time for you to reach destination
---------------------
For the car passing you:
+120+=+r%5B2%5D%2A%28+36%2F21+-+1%2F3+%29%7D%7D%0D%0A%28+note+that+%7B%7B%7B+20+ min = +1%2F3+ hr )
+120+=+r%5B2%5D%2A%28+36%2F21+-+7%2F21+%29+
+120+=+r%5B2%5D+%2A%28+29%2F21+%29+
+r%5B2%5D+=+%28+21%2F29+%29%2A120+
+r%5B2%5D+=+86.897+
The passing car must travel at 86.897 mi/hr