Xiaosong and Xiaoju compete to climb the stairs. They set off on the ground (first floor) of a tall building and return to the ground immediately after reaching the 28th floor. When Xiaosong reaches the 4th floor, Xiaoju has just reached the 3rd floor. If they maintain a constant speed, then Xiaosong will meet Xiaoju on the way back to the ground after reaching the 28th floor. (Note: The stairs between the first floor and the second floor belong to the first floor, and so on.) How much
小松、小菊比赛登楼梯．他们在一幢高楼的地面(一楼)出发，到达28楼后立即返回地面．当小松到达4楼时，小菊刚到达3楼，如果他们保持固定的速度，那么小松到达28楼后返回地面途中，将于小菊在几楼相遇．(注：一楼与二楼之间的楼梯，均属于一楼，以下类推．)多少
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