Question

A railroad track is laid along side the arc of a circle of radius 1800 ft. The circular part of the track subtends a central angle of 40 degrees. How long (in seconds) will it take a point on the front of a train traveling 30 mph to go around this portion of the track

Answer 1

the length of the arc is ... (40 / 360) * 2 * π * 1800

30 mph is 44 feet per second