SOLUTION: A jet traveled to Calgary, Alberta from St. John’s , Newfoundland, a distance of 4200 km. On the return, a tail wind increased the speed of the jet by 100 km/h. The total time wa

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: A jet traveled to Calgary, Alberta from St. John’s , Newfoundland, a distance of 4200 km. On the return, a tail wind increased the speed of the jet by 100 km/h. The total time wa      Log On


   

Question 1160458: A jet traveled to Calgary, Alberta from St. John’s , Newfoundland, a distance of 4200 km. On the return, a tail wind increased the speed of the jet by 100 km/h. The total time was 13 hours. What was the average speed of the jet from St. John’s to Calgary?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
No wind was applied for the trip from Calgary to Newfoundland, according to the description.

If r is the speed from Newfoundland to Calgary, then 4200%2F%28r-100%29%2B4200%2Fr=13. Simplify and solve for r.