Question

A car travels at a speed of 40km/hr for two hour and then at 60km/h for three hours.

What is the average speed of the car during the entire journey?

Answer 1

as we know that average speed = total distance/total time
=40*3+60*3/5
=300/5=60

Answer 2

car speed for two hr=40 km per hr

car speed for 3 hour =60 km per hr

car average speed=
$\frac{ \frac{40}{2} + \frac{60}{3} } {2}$
20+20/2

=20 km/ hr

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