Question

A man travela at speed of 20km/h and then returns at a speed of 30km/h. His average speed of the whole journey..!

Answer 1

ur ans is 20,30=50
50/2=25

Answer 2

Average speed = total dist/ total time
Dist= speed ×time
=20 km and 30 km respectively
Total time = 2 hrs
So
Average speed = 20+30/ 2
=50/2
=25 km/h