SOLUTION: A truck driver traveled at an average speed of 64 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

Question 1023982: A truck driver traveled at an average speed of 64 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 35 miles per hour. Find the average speed for the round trip.
Found 3 solutions by josgarithmetic, Alan3354, ikleyn:
Answer by josgarithmetic(39620)   (Show Source): You can put this solution on YOUR website!

rate time distance GOING 64 200 RETURN 35 200 Totals 400

RT=D relates rate, time, and distance. You need to fill-in the time cells in the table.

rate time distance GOING 64 200/64 200 RETURN 35 200/35 200 Totals 400

The average round-trip rate, before any simplifications, is ;
and you will want to simplify this.
Answer by Alan3354(69443)   (Show Source): You can put this solution on YOUR website!
A truck driver traveled at an average speed of 64 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 35 miles per hour. Find the average speed for the round trip.
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Avg speed of a round trip:
avg = 2*64*35/(64+35) = 4480/99 mi/hr
=~ 45.25 mi/hr
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Notice the distance is not relevant.
Answer by ikleyn(52803)   (Show Source): You can put this solution on YOUR website!
.
A truck driver traveled at an average speed of 64 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 35 miles per hour. Find the average speed for the round trip.
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See the lesson Calculating an average speed: a train going from A to B and back in this site.

You will find the detailed solutions of similar problems there (Problems 1 and 2).

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