<PRE><B>Question 826422</B>
 A person travels 24 miles at 6 mph, 20 miles at 10 mph and 20 miles at 5 mph. what is the persons average rate for the complete distance?
:
Find the total distance of the trip: 24 + 10 + 20 = 54 miles
let a = the average speed of the whole trip
write a time equation; time = dist/speed
{{{24/6}}} + {{{20/10}}} + {{{20/5}}} = {{{54/a}}}
4 + 2 + 4 = {{{54/a}}}
10 = {{{54/a}}}
10a = 54
a = {{{54/10}}}
a = 5.4 mph is the av speed of the trip</PRE>