1km = 1000m
1hr = 3600sec
Do proportions:
1km / 1000m = 15km / x
15000m = x
1hr = 3600sec
15000/3600 = 4.2m per second
Choice 4
I'm pretty sure that the answer is 71, hope it helped!

The number "x" is given by:
Therefore, we have:
Answer:idk
Step-by-step explanation:
Answer:
the first one. with two shaded dots and a line between them