Sun Xiao lives on the 10 floor, and Xiaogang walks from the 1 floor to the 4th floor in 48 seconds. How long does it take him to walk to the 10 floor at the same speed?
There are actually only three floors from the first floor to the fourth floor, 48 divided by 3= 16 (seconds/floor). If you walk from the fourth floor to the 10 floor, you actually only walk six floors, then 16*6=96 seconds. If you walk from the first floor to the 10 floor, it is 16*9= 144 seconds. If not, please advise!