<PRE><B>Question 1049061</B>
 In 1860 and 1861, riders of the Pony Express delivered mail on horseback from
St. Joseph, Missouri, to Sacramento, California.
 The trip of 1966 miles took about 10 days (240 hours).
:
a. What was the riders’ average speed to the nearest tenth of a mile per hour?
speed = dist/time
s = {{{1966/240}}}
s = 8.2 mph
:
b. A student estimates that it would take a Pony Express rider less than
6 hours to travel 75 miles.
 Is the student’s estimate reasonable? Explain
Make a proportion out of this. 
let t = actual time to go 75 mi
{{{t/240}}} = {{{75/1966}}}
cross multiply
1966t = 240 * 75
t = 18000/1966
t = 9.15 hrs to go 75 mi
:
:
Check: 8.2 * 9.15 = 75 mi</PRE>