Question 1143161

A motorcycle that travels 80km/h starts 45 minutes after a truck. If it overtake the truck in 15 minutes, what is the speed of the truck?
<pre>In 15 mins (¼ hour), and at a speed of 80 km/h, the bike traveled ¼(80), or 20 km
The truck also traveled 20 km, but in (45 + 15) mins, or 1 hour, so: {{{highlight_green(matrix(1,7, "Truck's", speed, "=", 20/1, "=", 20, "km/h"))}}}