Posted by BC on Friday, August 26, 2011 at 7:13pm.
distancecar= 60*t/60=t
distancetruck=70(t-7)/60 where is in minutes.
at passing, the distances are equal. set them equal and solve for time t.
t=7/6t-49/60
1/6t=49/60
t=4.9 minutes
check my work.
oops, error.
t=7/6 t -49/6
now solve for t
I would do it a different way. Since the car has a 7 Min headstart, traveling at 60mph, you can figure the distance it is ahead of the truck. Then, with the truck overtaking the car, by 10mph, you can figure the time it would take, going 10mph to go this headstart distance.
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