Question

a car travels 30 km at a uniform speed of 40 km per hour and 30 km at a uniform speed of 20 km find its average speed​

Answer 1

Answer:

average speed

Explanation:

i think it is a 10 km speed

Answer 2

Ist case

Speed=40km/hr

Distance=30km

Time=30/40

=3/4

2nd case

Distance=30km

Speed=20km/hr

Time=30/20

=3/2

Avg. speed= Total dist./Time taken

=(30+30)/(9/4)

=60*(4/9)

=80/3

=26.66km/hr