Question

pls answer fast
a man walks 6km at 12km/h and returns at 10km/h find His average speed

Answer 1

hola!
This question can be solved in two ways:

1. ] First way:-

→ From A to B:

Distance = 6km
Speed = 12km/h
Time taken = 6 /12 = 0.5 hr

→ From B to A:

Distance = 6km
Speed = 10km/h
Time = distance/ speed = 6/10 = 0.6 hr

Thus,
Average speed = Total distance / Total time taken

= (6 +6) /( 0.5 + 0.6)

= 12 /1.1

= 10.90km/h

2 ] Alternative way:

Average speed = 2v¹v²/ (v¹ + v²)

= (2 × 12 × 10) / (12 + 10)

= 10.90 km/h

Hence,
Average speed of man is 10.90 km/h

hope it helps! :)