Question

A car travels 30km at a uniform speed of 40km/h and next 30km at a uniform speed of 20km/h. Find the average speed. pls answer if you know​

Answer 1

Answer:

Average speed = total distance travell/total time taken

distance = 30km

speed = 40km/h

time =?

time = distance /speed

speed = 30/40

3/4hrs

for next car

distance= 30km

speed= 20km/h

time= ?

speed =30/20

=3/2 hrs

average speed= total distance/ total time

30+30/ 3/4+3/2

60/9/4

60×4/9

240/9

26.66km/h