John drove for 3 hours at a rate of 50 miles per hour and for 2 hours at 60 miles per hour. What was his average speed for the whole journey?
Average Speed = $\left(\dfrac{Total\; Distance}{Total\;Time}\right)$
$\dfrac{50 × 3 + 60 × 2}{5}$
$\dfrac{270}{5}$
= 54
The average speed is 54 miles per hour.
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