Question

A car's odometer read 22687 km at the start of a trip and 22791 km at end. The trip tool 4.0 hours. What was the car's average speed in km/h and in m/s.

Answer 1

$$v=\dfrac{d}{t},$$ $$v=\dfrac{22791\ km-22687 km}{4\ h}=26\ \dfrac{km}{h}\cdot\dfrac{1000\ m}{1\ km}\cdot\dfrac{1\ h}{3600\ s}=7.22\ \dfrac{m}{s}.$$

Answer:

$v=26\ \dfrac{km}{h}=7.22\ \dfrac{m}{s}.$