23 A Read aloud V Draw - Highlight 5. Ship A is traveling due west toward Lighthouse Rock at a speed of 15 km/hr. Ship B is traveling due north away from Lighthouse Rock at a speed of 10 km/hr. Let x be the distance between Ship A and Lighthouse Rock at time t and let y be the distance between Ship B and Lighthouse Rock at time t. (a) How fast is the distance between the two Ships changing at the instance x = 4 km and y = 3 km? (b) Let @ be the angle between the line of movement from Ship A to the Lighthouse Rock and the line connecting Ship A and Ship B. Find the rate of change of 0, in radians per hour, when x = 4 km and y = 3 km. 6. An astronaut standing on the moon throws a rock upward. The height of the rock is