SOLUTION: Santos flies a plane against a headwind for 3933 miles. The return trip with the wind took 12 hours less time. If the wind speed is 6 mph, how fast does Santos fly the plane when t

Question 1077432: Santos flies a plane against a headwind for 3933 miles. The return trip with the wind took 12 hours less time. If the wind speed is 6 mph, how fast does Santos fly the plane when there is no wind?
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!

                 SPEED    TIME             DISTANCE
AGAINST WIND      r-6     3933/(r-6)       3933
WITH WIND         r+6     3933/(r+6)        3933
Difference?                 12

Time against the wind took longer, so was larger.

Solve this for r.
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