Question

A boy goes from point A to point B with a velocity of 20m/s. And comes back from point B to A with velocity of 30m/s. The average velocity of the boy during the whole journey is​

Answer 1

Given: A boy goes from A to B with a velocity of 20m/min and comes back from B to A with a velocity of 30 m/min.

To find: We have to find the average velocity of the boy.

Solution:

Let the distance between A and B is D meter.

A boy goes from A to B with a velocity of 20m/min.

So the time =D/20

He comes back from B to A with a velocity of 30 m/min.

So, the time= D/30.

Total time=D/20+D/30

=5D/60

Total distance traveled by the boy =2D.

Average velocity of the boy is a ratio of total distance to total time.

\begin{gathered} \frac{2D}{ \frac{5D}{60} } \\ = \frac{2 \times 60}{5} \\ = 24\end{gathered}

60

5D

2D

=

5

2×60

=24

The average velocity of the boy during the journey is 24m/min.

Answer 2

Answer:

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