Posted by **BC** on Friday, August 26, 2011 at 7:13pm.

A car is traveling 60 mph. A truck leaves 7 minutes later and is traveling 70 mph. How long before truck will pass car?

- algebra -
**bobpursley**, Friday, August 26, 2011 at 7:49pm
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.

- algebra -
**bobpursley**, Friday, August 26, 2011 at 7:50pm
oops, error.

t=7/6 t -49/6

now solve for t

- algebra -
**coursonc**, Sunday, August 28, 2011 at 12:43am
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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