Question

A man covers first 1/3rd of the distance with a speed 20km/hr and the 2nd 1/3rd of the distance with a speed 40km/hr and the remaining distance with a speed 80km/hr. find the Average speed ​

Answer 1

Answer:

Let the total distance travelled be x km Then total time taken =

10

x/3

+

20

x/3

+

60

x/3

=

30

x

+

60

x

+

180

x

=

180

6x+3x+x

=

180

10x

=

18

x

hrs Then average speed = =

Totaltimetaken

Totaldistancetravelled

=

x/18

x

km/hr = 18 km/