For grade 5 students: A car goes from A to B with a speed at 45km per hour, but at the same time, an another car goes from B to A with a speed at 50km per hour. After 45 minutes, the two cars meet at each other. Find the length of the line segmet AB (Here's the hint: v(speed) = s(length) : t(time)

Length of the line segment AB: ........... km