SOLUTION: A truck with a heavy load drove from boston to new york at 45 mph. After unloading, it returned to Boston at a speed of 65mph. WHat was it's average speed for the whole trip?

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Question 1197202: A truck with a heavy load drove from boston to new york at 45 mph. After unloading, it returned to Boston at a speed of 65mph. WHat was it's average speed for the whole trip?
Found 2 solutions by ikleyn, Alan3354:
Answer by ikleyn(52814) About Me  (Show Source):
You can put this solution on YOUR website!
.
A truck with a heavy load drove from Boston to New York at 45 mph. After unloading, it returned to Boston
at a speed of 65mph. What was it's average speed for the whole trip?
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For the average speed of the round trip (when the distances of both parts of the trip 
are the same) use the formula


    average speed = %282%2Au%2Av%29%2F%28u%2Bv%29 = %282%2A45%2A65%29%2F%2845+%2B+65%29 = 5850%2F110 = 53.182 mph  (rounded).    ANSWER

Solved.

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For this formula see the lesson
    - Calculating an average speed: a train going from A to B and back
in this site.   Find there many other similar solved problems.



Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
A truck with a heavy load drove from boston to new york at 45 mph. After unloading, it returned to Boston at a speed of 65mph. WHat was it's [sic] average speed for the whole trip?
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Avg speed of a RT = 2%2Av%5B1%5D%2Av%5B2%5D%2F%28v%5B1%5D%2Bv%5B2%5D%29
= 2*45*65/(110) mi/hr
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it's = it is