Question

How long did it take Ted to drive 272 miles if his average speed was 68 mph

Answer 1

v-speed
t-time
s-distance

$v=\dfrac{s}{t}\to t=\dfrac{s}{v}$

s = 272 mi; v = 68 mph; t = ?

subtitute

$t=\dfrac{272}{68}\ h=4h$

Answer: Ted drove 4h.