Question

A motorcyclist drives from A to B with a uniform speed of 30 km/h & returns back with a speed of 20 km/h. Calculate its average speed & average velocity.​

Answer 1

Answer:

Let the length of the line segment AB be x m

The time taken is given as t=distance covered/speed

Total time = t

1

+t

2

=

30

x

+

20

x

=

60

5xh

Average speed = Total distance/Total time =

5x/60

2x

=24 km/h

Answer 2

Explanation:

Let the length of the line segment AB be x m.

The time taken as t = $\frac{distance \: covered}{total \: time}$

Total time =$t_{1}$ = $\frac{x}{30} + \frac{x}{20}$ = $\frac{5x}{60}$ h

Average speed = $\frac{total \: distance}{total \: time}$

= $\frac{2x}{5x/60}$

= 24 km/h