At noon, ship a is 50 km west of ship b. ship a is sailing south at 20 km/h and ship b is sailing north at 10 km/h. how fast is the distance between the ships changing at 4: 00 pm? (round your answer to one decimal place.)a ladder 10 ft long rests against a vertical wall. if the bottom of the ladder slides away from the wall at a rate of 1.5 ft/s, how fast is the angle between the ladder and the ground changing when the bottom of the ladder is 8 ft from the wall? mark rad/sboyle's law states that when a sample of gas is compressed at a constant temperature, the pressure p and volume v satisfy the equation pv = c, where c is a constant. suppose that at a certain instant the volume is 500 cm3, the pressure is 200 kpa, and the pressure is increasing at a rate of 20 kpa/min. at what rate is the volume decreasing at this instant?