For this problem, assume that Earth is spherical with radius (re) 6.371x106 m. a is the 8th (second last) digit of your student number, and b is the 9th (the last) digit of your student number. Assume that you are conducting a land survey, and in the process, you travel along longitude 100°W from latitude 50°N to latitude (50-a)°N, and then along latitude (50-a)°N from longitude 100°W to (100-0.5b) W over a period of 37 days. What is your average speed in km/h?