How do you solve these math problems? Provide steps & explanations please

The radius of the earth is about 6378.1 kilometers at the equator. Snowy the snowball lands in an airport in Ecuador and then rolls East along the equator at a speed of 4 kilometers per hour. How long will it take him to return to Ecuador? Assume that he does not melt along the way

The radius of the earth is about 6378.1 kilometers at the equator. Snowy the snowball lands in Ecuador and then rolls West along the equator. If he rolls at a constant speed of 14 miles per hour starting on December 1st, what is the date and time when he will be 210 degrees around the world?

The radius of the earth is about 6378.1 kilometers at the equator. Snowy the snowball lands in an airport in Ecuador on December 1st and then travels westward along the equator. If he travels 217 degrees around the earth at a constant speed before melting completely on January 1st, how fast was he traveling in miles per hour and where did he stop traveling?

Thank you! This would help me a bucket load!! :))

So if the radius is 6378.1 and the equator is a circle, then the circumference is 40074.8 km. At 4 km/h, it will take 10018.7 hrs = 417.4 days to return to Ecuador. (Answer)

210 degrees is 23377 km. x 0.6213711 mi/km = 14525.8 mi. At 14 mi/hr, this is 1037.6 hrs = 43.23 days. Arrival will be on 13 February at 5:33 a.m. (Answer)

217 degrees is 24156.2 km = 15010.0 mi (Answer). 31 days is 744 hours, so he traveled 20.2 mph. (Answer)