Question 1063305

 A car traveled for 1/2 hour at r mi/h then increased the speed by 10 mi/h and traveled for 1 1/2 hours more. How far did the car go? (Express the answer in terms of r.) 
<pre>Distance traveled on 1st leg: {{{matrix(1,5, (1/2) * r, or, r/2, or, .5r)}}}
Distance traveled on 2nd leg: {{{matrix(1,7, (1&1/2) * (r + 10), or, (3/2) * (r + 10), or, 1.5(r + 10), or, 1.5r + 15)}}}
Total distance traveled: {{{highlight_green(matrix(1,3, .5r + 1.5r + 15, or, highlight(2r + 15)))}}}