Posted by sydneeey on Tuesday, November 18, 2008 at 10:03pm.
let the time traveled by truck A be t hours, then A went 80t km
clearly the time traveled by truck B must be t-4 hours,
Didn't he then go 90(t-4) km
Now I wonder how far each of them went, ...
mmmmhhh?
The distance they travel is the same, and the time is 4 hours different.
DistanceA=80*time
DistanceB=90*(time-4)
set them equal, and solve for time. That is the total time, if you want the time B was traveling, subtract four hours.
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