A train travels a distance of 300 km with an average speed of 60 km h^-1. How much time does it take to cover the distance?

Distance = 300 km;
Average speed = 60 km h^-1
time = ?

$\text{Average speed} = \dfrac{\text{Distance travelled}}{\text{time}} \\[1em] \text{60} = \dfrac{\text{300}}{\text{time}} \\[1em] \text{time} = \dfrac{\text{300}}{\text{60}} = 5 \text{hr}$

So, time taken = 5 hour.