To get to a business meeting, John drove m miles in h hours, and arrived 1/2 hour early. At what rate should he have driven to arrive exactly on time?  Choose the correct choice from the following
A) m/2h B) 2m/(2h+1) C) 2m/(2h-1) D) 2m-h/2h E) none of these
m miles in h - 1/2 = (2h - 1)/2 hours   =&gt; 2m/(2h - 1) miles per hours   ANSWER:2m/(2h-1)
<result>C</result>
To get to a business meeting, John drove m miles in h hours, and arrived 1/2 hour early. At what rate should he have driven to arrive exactly on time?