A person is standing on a tower of height \[15(\sqrt{3}+1)\,m\] and observing a car coming towards the tower. He observed that angle of depression changes from\[{{30}^{o}}\]to\[{{45}^{o}}\]in 3 sec. What is the speed of the car [Karnataka CET 1998]

A person is standing on a tower of height \[15(\sqrt{3}+1)\,m\] and ob

1.	A person is standing on a tower of height \[15(\sqrt{3}+1)\,m\] and observing a car coming towards the tower. He observed that angle of depression changes from\[{{30}^{o}}\]to\[{{45}^{o}}\]in 3 sec. What is the speed of the car [Karnataka CET 1998]
A.	36 km/hr
B.	72 km/hr
C.	18 km/hr
D.	30 km/hr
Answer» B. 72 km/hr

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A person is standing on a tower of height \[15(\sqrt{3}+1)\,m\] and observing a car coming towards the tower. He observed that angle of depression changes from\[{{30}^{o}}\]to\[{{45}^{o}}\]in 3 sec. What is the speed of the car [Karnataka CET 1998]

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