A) 80 m
B) 100 m
C) 140 m
D) 280 m
E) None of these
Correct Answer: B
Solution :
Explanation Option (b) is correct. The movement of the child from A to E are as shown in figure. Finally the child meets his father at E. Now, AF = (90 - 30) m = 60m. EF = (DE - DF) = (DE - BC) = (100 - 20) = 80m. \[\therefore \] Required distance \[=\,AE=\sqrt{{{(AF)}^{2}}+{{(EF)}^{2}}}=\sqrt{{{(60)}^{2}}+{{(80)}^{2}}}=\sqrt{3600+6400}\] \[=\sqrt{10,000}=100m.\]You need to login to perform this action.
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