A man observes a car from the top of the building of height 20 \(m\) at an angle of depression of 30\(^{\circ}\). After 30 seconds, the angle of depression of the car is 60\(^{\circ}\). Find the speed of the car in \(km/hr\).
Answer:
Let \(AB\) be the height of the building. Let \(C\) and \(D\) be the position of the car.
\(BD=\)\(m\)
\(DC=\) \(m\)
The speed of the car is .
Answer variants:
23.09