18. Two planes left an airport at the same time. One flew north at a set speed and the other flew south at one-and-a-half times the speed of the other plane. Three hours later the planes
were 2400 miles apart. How fast was each plane flying?

i leave the calculator work to you.

7. diameter 4 miles, circumference 4π miles

8. radius 0.2 miles, circumference 0.4π miles

[this is a bad problem because the actual radius of a car on the track is less than 0.2 miles so the answer is less than 0.4π miles]

9. radius 6 feet, circumference 12π feet

10. diameter 14 cm, circumference 14π cm

11. diameter 4.8 feet, circumference 4.8π feet

15

step-by-step explanation:

answer: 414,377,008

step-by-step explanation:

just multiply it