A) \[40\left( \sqrt{2}-1 \right)\]
B) \[40\left( \sqrt{3}-\sqrt{2} \right)\]
C) \[20\sqrt{2}\]
D) \[20\left( \sqrt{3}-1 \right)\]
Correct Answer: D
Solution :
Here, \[AP=QB=20m\] \[\angle POA={{45}^{o}},\angle QOB={{30}^{o}}\] \[\Rightarrow \]\[OA=20;OB=20\sqrt{3}\] \[\Rightarrow \]\[OB-OA=20(\sqrt{3}-1)\] Hence distance covered in one second by the bird is \[AB=20(\sqrt{3}-1)\] Thus, speed of bird \[=20(\sqrt{3}-1)m/s\]You need to login to perform this action.
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