At noon, ship A is sailing north at a speed of 7mph, at the same time ship B, 5 miles west of ship A, is heading south at a speed of 10mph. How fast is the distance between the two ship changing at 2:00pm?

At noon, ship A is 30 nautical miles due west of ship B. Ship A is sailing west at 22 knots and ship B is sailing north at 16 knots. How fast (in knots) is the distance between the ships changing at 4 PM? The distance is changing at knots. (Note: 1 knot is a speed of 1 nautical mile per hour.)

It took a salmon 45 seconds to swim upstream to a certain spot. The salmon then turned around to swim with the current and arrived at its starting place in 17 seconds. If the current in that part of the stream is 0.43 meters per second, what was the speed of the salmon?

Station A is at 130.6 km to the west of station B. At 11:00 am, car left station B north at a speed of 35.8 km/h. At noon, a car left station A toward east at a speed of 40.7 km/h. How fast is the distance between the cars changing at 3:00 pm? Round the final answer to the nearest whole number. Provide a sketch.