Please help me with the question 20 and 22

20. A baseball diamond is a square with side 90 ft. A batter hits the ball and runs toward first base with a speed of 24 ft/s. a. At what rate is his distance from second base decreasing when he is halfway to first base? b. At what rate is his distance from third base increasing at the same moment? 90 ft 21. The altitude of a triangle is increasing at a rate of 1 cm/min while the area of the triangle is increasing at a rate of 2 cm2 / min. At what rate is the base of the triangle changing when the altitude is 10 cm and the area is 100 cm? Answer 22. A boat is pulled into a dock by a rope attached to the bow of the boat and passing through a pulley on the dock that is 1 m higher than the bow of the boat. If the rope is pulled in at a rate of 1 m/s, how fast is the boat approaching the dock when it is 8 m from the dock