Hi guys.. i was studying calculus and i found some problems in solving these two questions.. would you please help me to figure out the answers? 1) At noon ship A is 150 km west of ship B. Ship A is sailing East at 35 km/h and ship B is sailing North at 25 km/h. How fast is the dstance between the ships changing at 4 pm? 2) a spotlight on the ground shines on a wall 12 meters away. if a man 2 meters tall walks for the spotlight toward the building at a speed of 1.6 meter per second, how fast is the length of his shadow on the building decreasing when he is 4 meters from the building?