Maria cycles 3 kilometers to get to the park each day. Her route consists of segments of equal length and she takes seconds to cycle each segment. Today, after cycling segments, Maria discovers she has to make a detour, cycling segments of equal length instead of segment to reach the next junction. From the time she starts her detour, at what speed, in km/h, must she cycle, in order to get to the park at her usual time? 
30
32
34
36
38
