Anyone who could me with this problem it would be most appreciated, along with those who can also add a step-by-step explanation. these types of problems always confuse me because i don't know where to start, and most of the time i can get going if i know what to do from the beginning.
"an airplane flying into the wind travels 1809 miles between two cities in 3 hours and 36 minutes. on the return flight, the same distance is traveled in 3 hours. find the ground speed of the plane and the speed of the wind in miles per hour, assuming both remain constant. (ground speed is the speed of the plane if there were no wind.)"
- kathryn irene
(15 pts)

The perimeter of a triangle is 69 cm. the first is 5 cm shorter than the second side. the third side is twice as long the first side. find the length of each side

Submarines control how much they float or sink in the ocean by changing the volume of air and water contained in large ballast tanks. when the tanks are completely full of water, the submarine increases its overall mass and sinks down to the bottom. when the tanks are completely full of air, the submarine reduces its overall mass and floats to the surface. depending on the density of the seawater surrounding the submarine, it will pump seawater in or out of the tanks in order to achieve the same overall density as the sea water and float neutrally in the water. the volume of the submarine never changes. when the tanks are completely full of water, a submarine with a volume of 7.8\times10^3\text{ m}^37.8×10 3 m 3 7, point, 8, times, 10, start superscript, 3, end superscript, space, m, start superscript, 3, end superscript has a total mass of 8\times10^6\text{ kg}8×10 6 kg8, times, 10, start superscript, 6, end superscript, space, k, g. the density of the seawater is 10^3\text{ kg/m}^310 3 kg/m 3 10, start superscript, 3, end superscript, space, k, g, slash, m, start superscript, 3, end superscript. to make that submarine float neutrally, and neither float nor sink in the ocean, what volume of water does that submarine need to subtract from its tanks?

92ft long and 48 wide resurface 2.75$