Question

If a car travels 20 km at a speed of 20km/h, what will the speed be for the remaining 20km if the average speed of the journey is 24km/h?

Answer 1

12

Step-by-step explanation:

avarage speed = total distance/total time

our total distance is 40km

the first 20km speed was 20km/h, so the time os 1 hour here

for the next 20km, we dont have the time, so let the time here be = x

so total time is x+1 km/h

and total distance is 40km

and the avarage is 24km/h

so =>

`(40)/(1 + x) = 24`

solve for x to find the time in the second 20km

so x=0.6

then find the speed of the second 20km by diving the distance on time =>

`(20)/(0.6) = 12`

so the speed in the second 20km is 12km/h