It should me the number 32
The distance between Earth and the moon is 3.8 x 10^3 Kilometers. The time taken to travel this distance was 2.1 x 10^3 Minutes.
The formula to calculate speed is Speed = distance/time.
So, the speed of Luna I was 3.6 x 10^3 / 2.1 x 10^3 Kilometers/Mintues.
Step-by-step explanation:
a) The total cost C is given by
![C = \$60n + \$40](https://tex.z-dn.net/?f=C%20%3D%20%5C%2460n%20%2B%20%5C%2440)
b) If the total cost is $400, then we can solve for the number of hours as
![\$400 = \$60n + \$40 \Rightarrow \$360 = \$60n](https://tex.z-dn.net/?f=%5C%24400%20%3D%20%5C%2460n%20%2B%20%5C%2440%20%5CRightarrow%20%5C%24360%20%3D%20%5C%2460n)
Solving for n, we get
![n = \dfrac{\$360}{\$60} = 6\:\text{hrs}](https://tex.z-dn.net/?f=n%20%3D%20%5Cdfrac%7B%5C%24360%7D%7B%5C%2460%7D%20%3D%206%5C%3A%5Ctext%7Bhrs%7D)
I’m not sure if this was what you wanted but I used an app to calculate it.