Question 1131120

"Julio intends to drive his motorbike to a friend's house 200 kilometers away. If he increases his planned rate of speed by 10km/hr, he can decrease his travel time by 40 minutes. What is his planned rate of speed?" 

I made a RxT=D chart and I had an original rate and a new rate.

Original Rate | R = x - 10 | T = 200/(x-10) | D = 200

New Rate | R = x + 10 | T = 200/(x+10) | D = 200

I feel like I filled out the chart a bit off and thus resulting in solving my problem wrong. (I wasn't able to multiply & distribute all the way through so I didn't get an answer)
<pre>Correct answer: {{{highlight_green(matrix(1,2, 50, "km/h"))}}}
IGNORE STANBON's RIDICULOUS answer!!