Question 1157793

Kathy was travelling "d" miles to Miami at "n" miles per hour and arrived 3 hours late for the beach party. How fast should she have travelled to arrive on time?
Please show work thanks!!
<pre>Time taken to get to party: {{{d/n}}}
On-time time to get to party: {{{d/n - 3}}}
Speed to get there on time: {{{highlight_green(matrix(1,7, d/(d/n - 3), "=", d/((d - 3n)/n), "=", d * (n/(d - 3n)), "or", highlight(matrix(1,2, dn/(d - 3n), mph))))}}}