Question

Formula to calculate average speed of 3 persons

Answer 1

suppose:-

First person Distance is 20km

and Time is 2hr

second person distance is 30 km

and time is 3hr

third person distance is 40 km

and time is 4hr

Then:-

first person speed:-

speed = Distance

time

= 20

2

speed = 10km/hr

second person speed:-

speed = Distance

time

= 30

3

speed = 10km/hr

third person speed:-

speed = Distance

time

= 40

4

speed = 10km/hr

Now take:-

total distance = 20+30+40 = 90km

total time = 2+3+4 = 9hr

average speed = total distance

total time

average speed = 90

9

average speed = 10 km/hr

so the average speed of 3 person is 10 km /hr