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Travel Times

by John Ulbright

Travel Times

Act One

  • Teacher note
    Why aren't they the same ratio? There's some rounding that happened (since the billboard can't display the tenths place). In other words, the 4 minutes should really be interpreted as [3.5, 4.5), etc.

Act Two

  • Teacher note
    I'd set up 3.5 (less than or equat to) t (less than) 4.5 to begin doing this algebraically, then tie in d = rt. Allows you to establish some intervals for possible speed limits. In the end, only one reasonable solution (55 mph) remains.

Act Three

  • Teacher note
    I'll add a picture of the speed limit sign shortly.


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