Find x.
$\dpi{100} \small 50$
$\dpi{100} \small 0.25$
$\dpi{100} \small \frac{8}{25}$
$\dpi{100} \small \frac{25}{8}$
None
A jet goes from City 1 to City 2 at an average speed of 600 miles per hour, and returns along the same path at an average speed if 300 miles per hour. What is the average speed, in miles per hour, for the trip?
400miles/hour
300miles/hour
350miles/hour
450miles/hour
500miles/hour
