Question 279596
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The ratio of the two speeds is 5:1.<br>
Oscar takes 4 hours more than it takes Pablo to travel the 90 miles.  If t is the number of hours Pablo takes to travel the 90 miles, then t+4 is the number of hours it takes Oscar to travel those 90 miles.<br>
Since the distances are the same, the ratio of the two times is 5:1.<br>
(t+4):t = 5:1<br>
{{{(t+4)/t=5/1}}}
{{{5t=t+4}}}
{{{4t=4}}}
{{{t=1}}}<br>
It takes Oscar t+4 = 5 hours to travel the 90 miles, so his speed is 90/5 = 18 mph.<br>
ANSWER: 18 mph<br>