Question

7. A car moves through 20 km at a speed of 40 km/h.
and the next 20 km at a speed of 60 km/h. Calculate
its average speed​

Answer 1

Answer:

Total distance covered=(20+20)km=40km

Total time taken=(20/40+20/60)=5/6h...(1)

So average speed=40÷(5/6)=40×(6/5)=48km/h.....(2)

Explanation:

Time taken=Distance covered/Speed...(1)

Average speed=Total distance covered/Total time taken...(2)

Answer 2

Answer:

2/5

Explanation:

Average speed= Total distance travelled ÷Total time taken.So, first we add both the distance from which the car moves I.e . 20+20= 40 .Then we add both the speed traveled by the car 40+60=100.Then we divide both of them.And lastly by dividing we got answer 2/5