A passenger on a stopped bus notices that rain is falling vertically now outside the window. When the bus moves by constant velocity, the passenger observes that the falling raindrops are now making an angle of 15 with respect to the vertical.
1. What is the ratio of the speed of the raindrops to the speed of the bus?
2. Find the speed of the raindrops, given that the bus is moving by a speed of 18 m/s?