Riddle me this, /sci/man!

No.13847376 ViewReplyOriginalReport
If Earth's orbit speed is 29.78 km/s, what is the speed in mph?

If the average curvature of the earth is 8 inches per miles squared, what is that in feet?

If the Earth's tilt is 23.4 degrees off center, the center being a 90 degree angle what is the earth's tilt?