Answer to Question #113143 in Mechanics | Relativity for Mateus Michael Ndinomwene

Question

5. The car travelling 88km/h is 200m behind a truck travelling at 65km/h. how long it will
take the car to reach the truck.

Answer 1

The relative velocity of the cur with respect to truck

$$v_{\rm r}=v_{\rm car}-v_{\rm truck}=88-65=23\:\rm km/h=6.4\: m/s$$

Hence, the cur reaches the truck after

$$t=d/v_{\rm r}=200/6.4=31.3\:\rm s.$$