Someone went to work on the seventh floor of a ten-story building. Unfortunately, the power went out and the elevator stopped. If it takes 48 seconds to go from the first floor to the fourth floor, how many seconds will it take to go up to the seventh floor at the same speed?
某人到十层大楼的第七层办事，不巧停电，电梯停开．如果从一层走到四层要48秒，那么以同样的速度往上走到七层，还需要多少秒才能到达．
<result>48</result>