Question

A motorcyclist drives from A to B with a uniform speed of 30 km/h and returns back with a speed of 20km/h-¹ find the average speed ?
PLEASE DO IT AS FAST YOU CAN AND NO SCAM ANSWERS OR ELSE I WILL REPORT​

Answer 1

Answer:

Average speed = 24 km/h

Explanation:

• Let the distance be x.

Given the following data;

Uniform speed A = 30 km/h

Uniform speed B = 20 km/h

To find the average speed;

Mathematically, the average speed of an object is given by the formula;

$Average \; speed = \frac {total \; distance}{total \; time}$ ..... equation 1

Total time = TA + TB

$T_{A} = \frac {x}{30}$

$T_{B} = \frac {x}{20}$

$Total \; time = \frac {x}{30} + \frac {x}{20}$

$Total \; time = \frac {5x}{60}$

Total distance = x + x

Total distance = 2x

Substituting the values into equation 1;

$Average \; speed = \frac {2x}{\frac {5x}{60}}$

$Average \; speed = \frac {2x*60}{5x}$

$Average \; speed = \frac {120}{5}$

Average speed = 24 km/h