Question

Topic:speed Question (b) do only.Fastest anwser will be brainliest

Answer 1

Answer:

Step-by-step explanation:

To find the average speed, you want to find the total distance and divide it by the total time.  They give you information about two sections of the run that allows you figure this out.

1. During the first part of the run, she ran 3.5 hours at a speed of 7 km/h.  To find the the distance she ran, multiply the speed times the time:  3.5 x 7 = 24.5 km.

2. During the second part of the run, she ran 12.5 km.

So the total distance she ran is 24.5 + 12.5 = 37 km.

They tell you that the total time was 6 hours.

So you have everything you need.  Divide 37 by 6 to get the average speed, which comes to 6 1/6 km/h.