Question

A car travels 13 km in 2 hours and 2 km in 1 hour

in the same direction. What is the car's average

speed in km/hr and m/s for the whole journey?

Answer 1

The average speed

$$v_{ave}=\frac{d_1+d_2}{t_1+t_2}=\frac{13+2}{2+1}\\ =5\:\rm km/hr=18\: m/s$$