Question 27
Cars $A$ and $B$ travel the same distance. Car $A$ travels half that distance at $u$ miles per hour and half at $v$ miles per hour. Car $B$ travels half the time at $u$ miles per hour and half at $v$ miles per hour. The average speed of Car $A$ is $x$ miles per hour and that of Car $B$ is $y$ miles per hour. Then we always have