PROBLEM FOR MATH PEOPLES ?

A train moves at a constant of 60km/hr towards a station 30 km away. At that moment , Fanny Fastbird leaves her perch on the locomotive and flies toward the station at a constant speed of 100km/hr relative to the ground . When the bird reaches the station , she immediately turns around and flies back to the train at the same speed . When reaching the train she again immediately turns around and flies back to the station , repeating the process until the train passes the station . What is the total distance traveled by the bird ?