Question 923757

A car and a truck start at the same point and travel in opposite directions. The car travels 8 mi per hour faster than the truck. After 3 hours the car and the truck are 354 mi apart. Find the average speed of the car and truck.

I did 3(x+8)=354.    X+y=118
        3y=354.           y=118
But it makes no sense. Im trying to do it like ive been doing the upstream down stream but cant figure it out. Please help! Thank you!
<pre>
Let truck's speed be S
Then car's speed = S + 8
In 3 hours, truck has covered: (3S) miles
In 3 hours, car has traveled:  3(S + 8), or (3S + 24) miles
In 3 hours, both vehicles have traveled a total of 354 miles
Therefore, it can be said that: 3S + 3S + 24 = 354
Solve of S, the speed of the truck
Add 8 to truck's speed to get car's speed

You should get:
Truck's speed: {{{highlight_green(55)}}} mph
Car's speed:   {{{highlight_green(63)}}} mph