Question

A car moving on a straight road covers the one third of the total distance with 20 km/h and the rest with 60 km/h. The average speed is

(1)40 km/h
(2)36 km/h
(3)26 km/h
(4) 80 km/h​

Answer 1

Explanation:

Correct option is

C

36 km/h

Given,

Velocity for one third of distance V1= 20km/h

Velocity for two third of distance V2 =60km/h

Time take to cover one third of distance t1

= V 1d/3= 20d/3

Time taken to cover two third of distance t 2 = V 2

2d/3

=

60

2d/3

Average velocity =

totaltime

Totaldistance

V

av

=

t

1

+t

2

d

=

20

d/3

+

60

2d/3

d

=36km/h

Answer 2

Answer:

the average speed is equal to the addition of both the speeds by 2

= a+b/2

=20+60/2

=80/2

=40km/h

hence the average speed is equal to 40 km/h

Explanation:

here we us the formula A+B/2 to find the average speed of the journey

hope that this was helpful to you pls verify this answer before using it for ur reference