Xiao Ming walked along a 70 meter straight road. He took 110 steps for the first time, 111 steps for the second time, 109 steps for the third time and 110 steps for the fourth time. What is the average length of one step

70x4÷（110+111+109+110）＝280÷440＝28/44＝7/11
A: the average length of a step is 7 / 11m

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