SOLUTION: A truck driver traveled at an average speed of 60 miles per hour on a 200-mile trip to pick up a load of freight. On the return trip (with the truck fully loaded), the average spee

Click here to see ALL problems on Travel Word Problems

Question 902767: A truck driver traveled at an average speed of 60 miles per hour on a 200-mile trip to pick up a load of freight. On the return trip (with the truck fully loaded), the average speed was 39 miles per hour. Find the average speed for the round trip. (Round your answer to one decimal place.)
Found 2 solutions by Alan3354, adamhen894:
Answer by Alan3354(69443) (Show Source):
You can put this solution on YOUR website!
A truck driver traveled at an average speed of 60 miles per hour on a 200-mile trip to pick up a load of freight. On the return trip (with the truck fully loaded), the average speed was 39 miles per hour. Find the average speed for the round trip. (Round your answer to one decimal place.)
------------
Avg speed of the RT = 2*60*39/(60+39)
The distance is not a factor.

Answer by adamhen894(15) (Show Source):
You can put this solution on YOUR website!
let x be speed (mph) for round trip
for the outbound
d= 200mile
r= 60mph
t= 200/60h
for the return trip
d= 200mile
r= 39mph
t= 200/39h
total distance is 400 mile
total time is (200/60)+(200/39) h
400=x((200/60)+(200/39))
solve the equation, you will find the unknown.
which is approximately 47.273h