SOLUTION: A truck with a heavy load drove from Boston to New York at 45 mph. After unloading, it returned from New York to Boston at a speed of 65 mph. What was its average speed for the who

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Question 919592: A truck with a heavy load drove from Boston to New York at 45 mph. After unloading, it returned from New York to Boston at a speed of 65 mph. What was its average speed for the whole trip?
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39620) (Show Source):
You can put this solution on YOUR website!
Both parts of equal distances.

________________rate__________time_________distance
Heavy___________45___________________________d
Light___________65___________________________d

Average speed is total distance divided by total time.

Answer by MathTherapy(10552) (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 from New York to Boston at a speed of 65 mph. What was its average speed for the whole trip?

Let distance from New York to Boston, and vice-versa, be D
Then, time taken to travel from Boston to New York is:
Also, time taken to travel from New York to Boston is:
Total time taken for entire trip: ____________
Average speed:
Average speed:
Average speed:
Average speed: ------ Canceling 2D in numerator and denominator
Average speed: , or mph