Question

A man went uphill with speed 20 km. P. H. And came downhill with 30 km. P. H. Find average speed of journey

Answer 1

average speed=2XxY/X+Y
(2x20x30)/20+30
1200/50
24

Answer 2

Answer:

24 km/ h

Step-by-step explanation:

Given :A man went uphill with speed 20 km. P. H. And came downhill with 30 km. P. H.

To Find :Find average speed of journey

Solution:

Since the distance is same in both the cases

So, Formula of average speed = $\frac{2xy}{x+y}$

where x and y are the speeds

x = 20 km/h

y = 30 km/h

Substitute the values in the formula :

So, Average speed = $\frac{2\times 20 \times 30}{20+30}$

Average speed = $\frac{1200}{50}$

Average speed = $24km/h$

Hence The average speed of journey is 24 km/ h