Question

A man goes uphill with an average speed of 45 km per hour and comes down with an average speed of 35 km per hour. The distance travelled in both the cases being the same. Find the average speed for the entire journey.

Answer 1

average speed is the average of both speeds
so v=45+35/2
v=80/2
v=40m per s

Answer 2

Average speed will be 45+35/2=40m/s