Question

A motorist travelled 60km in 1 hours and a further 90km in 2 hours. His average speed in km/hr for the entire journey was??

Answer 1

To get average speed you take:

Total distance / total time = average speed

As we can see, the total distance that the motorist travelled was:

$60km+90km=150\operatorname{km}$

And, the total time taken is:

$1h+2h=3h$

Then, his average speed is:

$\frac{150\operatorname{km}}{3h}=\frac{50\operatorname{km}}{h}$