A motorcyclist drives from a to b with a uniform speed of 30 km/h and returns back with a speed of 20 km/h. Find its average speed?

Given: A motorcyclist drives from a to b with a uniform speed of 30 km/h and returns back with a speed of 20 km/h

To find:  average speed

Solution:

We know that,

$Average\ speed\ =\ \frac{Total\ distance}{Total\ time}$

let the distance between a to b is 'd' metres.

=> average speed =  $\frac{d\ +\ d}{\frac{d}{30} \ +\ \frac{d}{20}}$

=> average speed = $\frac{2d}{\frac{50d}{600}}$ = $\frac{2d\times \ 600}{50d} \ =\ \frac{1200}{50} \ =\ 24\ m/s$

Therefore, average speed = 24 m/s

Tutorialspoint

Simply Easy Learning

Updated on: 10-Oct-2022

112 Views

Kickstart Your Career

Get certified by completing the course

Get Started