Kyle and his brother Joel leave a rest stop at the same time traveling in opposite directions. After traveling for 6 hours, they are 780 miles apart. If Kyle drives 10 miles per hour faster than Joel, how fast was Joel traveling? Kyle and his brother Joel leave a rest stop at the same time traveling in opposite directions. After traveling for 6 hours, they are 780 miles apart. If Kyle drives 10 miles per hour faster than Joel, how fast was Joel traveling?If anyone could explain, that would be great.
Accepted Solution
A:
Kyle's speed is represented by variable k. Joel's speed is represented by variable j.
Kyle is 10 mph faster. k= j+10.
Driving in opposite directions after 6 hrs, they are 780 mi apart. 6j + 6k=780
Substitute for k 6j+ 6(j+10)=780 6j+6j+60=780 12j+60=780 12j=720 j=60