I was wondering if someone can show me the work on these questions that I wasn't able to understand.

1.) Peter can mow the lawn in 40 minutes. When he works together with his friend, John, the lawn is mowed in 24 minutes . How long would it take John to mow the lawn on his own?

2. ) Jody can bicycle at a rate of 16 mph when there is no wind. Against the wind, Jody bikes 9 mi in the same time that it takes him to bike 15 mi with the wind. What is the speed of the wind?

3) Draw appropriate diagram and solve triangle ABC given that

4) Given f(x) = 2-x2 and g(x) = 2x-1 , find the composition (fg) (x)

5.) A chemist needs 12 L of a 40% alcohol solution. She must mix a 25% solution and a 75% solution . How many litres of each will be required to obtain what she needs.