You need to write an equation to represent the situation. You can start by using the formula for distance, d=rt, where d is dist
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In this question, angle 5 and angle 2 are linear pair. And angles of linear pair are supplementary angles .
Therefore
And sum of interior angles of a triangle is 180 degree, that is
SInce both the equations have 180 in the right side, left side of both equations are equal too . That is
Which gives
So the correct option is A .