Question

A car covers a certain distance with a speed of 60 kph. During the return journey, the speed of the car is 180 kph. If the average speed of the car during the entire journey is v, then find the value of v/30
.

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/hr