Question

A person covers a distance 'd' km from 'A' to 'B' with 20 km /h and returns through the same path from 'B' to 'A' with 30 km/h.The average speed of person's trip

25km/h

24km/h

20km/h

30km/h​

Answer 1

Answer:

24km/h.

Explanation:

Average speed = total distance /total time

total distance = x + x = 2x

time from A to B = distance / velocity= x /20

time from B to A = distance/velocity = x /30

total time = x/20 + x/30

= 50 x /600

now,

Average speed = total distance / total time

= 2x/50x/600

= 1200x/50x

= 1200/50 = 24km/h.

Answer 2

Answer:

it's 24 km/ h

Explanation:

average velocity = (2×V1V2)÷v1+v2