A train starts from rest at a station. It accelerates uniformly at 0.6m/s2 for 30s, then travels at the speed it has reached for 60s, and finally decelerates uniformly at 1.2m/s2 until it comes to rest. Calculate the total distance covered by the train from start to finish.
a) 1620m
b) 1485m
c) 1215m
d) 1755m