A runner,jogging alone a staight line path,starts at a posit

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A runner,jogging alone a staight line path,starts at a position 60m east of a milestone marker and heads west.After a short time interval he is 20m west of the mile marker.Choose east to be the positive x direction.
What is the runner's displacement from his starting point?
What is his displacement from the milestone?
The runner then around and heads east.If at a later time the runner is140m east of the milestone,what is his displacement from the starting point at this time?
还有最后一题
what is the total distance traveled from the starting point if the runner stops at the final position listed in part (c)?

视乎是数学题
What is the runner's displacement from his starting point?
-80
What is his displacement from the milestone?
-20
what is his displacement from the starting point at this time?
+60
再问：还有一个问题抱歉顺便解释一下好么

keep a staight face 英语翻译Scott starts jogging from point X to point Y.A half-hour Your brother starts out 10 minutes before you on a bike path a worn path She usually starts the day_____breakfast.A、withB、inC、forD、at Competition between families starts at a yong age. the school day starts at eight a.m同义句 Happiness comes from thinking about things _________ a posit A real estate recruiter we worked with illustrates the posit He is a good runner.He runs very____.He is a good at basketb We should wait_____,not_____in line.A.at line,cut B.in line, Jogging is basically running at a steady (稳定的) speed over sh