Question 920437
A trucker drove an average of 40 mph for the first 4 hours.
 for the next 6 hours which completed his route, he averaged 55mph,
 what is the average speed for the whole trip?
:
From the information given, we can find the total distance and total time
4(40) + 6(55) = 490 miles in 10 hrs
Av speed = dist/time: 
av = {{{490/10}}}
av = 49 mph for the whole trip