Question 1205338
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Dear tutor @MKST !


Glad to see you acting at this forum.    Come again more often !



The fact that the height of the observer is not given,  means that this height is  IRRELEVANT.


In other words, it means  (by default)  that the problem  SHOULD  BE  solved 
in the simplest arrangement from the point of view of an ant crawling on the grass.