SOLUTION: Jack and Jill are traveling to Orlando. The trip take 2hrs for Jack and 3.5hrs for Jill, since she lives 80mi farther. Jill travels 10mph faster than Jack. Find the speed of Jack

Let x be the speed of Jack.


Then the distance Jack traveled during 2 hours was  2x.


Jill traveled 80 miles more, so she traveled  (2x+80) miles.


Her speed was (x+10) miles per hour.

She spent 3.5 hours, hence


    3.5*(x+10) = 2x + 80.


Solve the equation


    3.5x + 35 = 2x + 80

    3.5x - 2x = 80 - 35

    1.5x = 45

    x =  = 30 miles per hour was the Jack' speed.     ANSWER