Homework Help: 7th Grade Math

Posted by Rebecca on Wednesday, January 4, 2012 at 10:48am.

Carlos and maria drove a total of 258 miles in 5 hours. carlos drove the first part of the trip and averaged 50 miles per hour. maria drove the remainder of the trip and averaged 55 miles per hour. for approximately how many hours did maria drive?

7th Grade Math - Reiny, Wednesday, January 4, 2012 at 12:55pm
let Carlos' time be t hrs
then Maria's time is 5-t hrs

solve for t

50t + 55(5-t) = 258

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