Please Help me!!!

1.Sally can paint a room in 66 hours while it takes Steve 8 hours to paint the same room. How long would it take them to paint the room if they worked​ together?

2.Three postal workers can sort a stack of mail in 3030 ​minutes, 4545 ​minutes, and 9090 ​minutes, respectively. Find how long it takes them to sort the mail if all three work together.

3.Mattie Evans drove 100100 miles in the same amount of time that it took a turbopropeller plane to travel 460460 miles. The speed of the plane was 180180 mph faster than the speed of the car. Find the speed of the plane.

4.The speed of a river current is 55 mph. If a boat travels 2020 miles downstream in the same time that it takes to travel 1010 miles​ upstream, find the speed of the boat in still water.

5.One hose can fill a goldfish pond in 2424 ​minutes, and two hoses can fill the same pond in 1515 minutes. Find how long it takes the second hose alone to fill the pond.

6.A plane flies 495495 miles with the wind and 440440 miles against the wind in the same length of time. If the speed of the wind is 1010 ​mph, find the speed of the plane in still air.