Question

A boy covers half the distance with speed ofv20m/s and other half distance with 30 m/s the avarag speed of boy during whole journey is​

Answer 1

Answer:

Average speed is 24 m/s

Explanation:

By using the formula 2V1V2/(V1+V2)

Therefore it is 2×20×30/(20+30)

1200/50=24m/s

Answer 2

Ans.24 m/s

Explanation:Let the total distance be 2x.

     for the first half distance:

        speed is 20m/s

thus,time taken t1 = X/20

for second haft distance:

speed is 30m/s

thus time taken t2=X/30

average velocity Vavg=2X/t1+t2

----> Vavg =2x/x/20+x/30

=2x20x30/20+30

=24m/s