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Text File  |  1991-12-18  |  418b  |  11 lines
  1. p:1
  2. i:$distance:400
  3. i:$time1:4
  4. i:$time2:2
  5. q:An airplane went a distance of $distance miles against a steady
  6. q:wind in $time1 hours and returned (being helped by the same wind)
  7. q:in $time2 hours. What was the rate of the wind?
  8. a:($distance/$time2-$distance/$time1)/2
  9. h:(v(plane)+v(wind))*$time1 = $distance.
  10. h:(v(plane)-v(wind))*$time2 also equals $distance.
  11. h:Solve these questions for v(plane) and v(wind).