Very basic time questions

  • Thread starter taraxrose
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  • #1
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Homework Statement


Jerry Kramer and Elaine are driving from Dallas to Chicago, a distance of 925 mi. Jerry leaves at 7:12 AM and averages 64 mi/h. Kramer leaves at 6:38 AM and averages 71 mi/h. Elaine leaves at 5:55 AM and averages 66 mi/h. Newman departs Chicago heading for Dallas at the same time Kramer leaves at a speed of 75 mi/h.

c. At what time does Jerry pass Newman?
d. What percentage of the trip has Elaine completed at the time Newman has completed 70% of his trip?

Homework Equations


I have no idea, sorry, other than the speed equation maybe that I already used. I have no idea how to answer those questions although I know it should be easy.


The Attempt at a Solution



I know they end up at their destinations at these times:
Newman: 6:58 PM
Kramer: 7:39 PM
Jerry: 9:39 PM
Elaine: 9:04 PM
 

Answers and Replies

  • #2
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c) Where is Newman when Jerry leaves Dallas? What is their speed difference?

d) If Newman leaves at 6:38 AM and arrives at 6:58 PM, when did he complete 70% of his trip?

Those are questions you should ask yourself to solve problems like that.
 
  • #3
CWatters
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You should also ask yourself what variables are the same for Newman when Jerry when they pass.
 

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