6. (6 points) Batman is trapped in a glass elevator, and needs to know how fast he is going to formulate an escape plan. The Riddler stands on the ground 30 meters away from the base of the elevator. Batman measures the angle between a horizontal line and the straight line between him and the Riddler: he finds the angle is changing at a constant rate of 1/10 radians / second. How fast is Batman going up when he is 10V3 meters off the ground? Include units in your answer, and simplify it as much as you can without a calculator.