Book Maths Puzzle Time Distance and Speed

Two cars leave from Alexandria, Virginia at the same time and travel in opposite directions. One car travels 15 mph faster than the other. After 3 hours they are 405 miles apart.

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Q1. The speed of a stream is 6MPH. If a boat travels 92 miles downstream in the same time that it takes to travel 46 miles upstream, what is the speed of boat in still water. ( I know the answer is 18 MPH, just need to know the solution)

Q2. Martha can rake the leaves in her yard in 2 hours. Her younger brother can do the job in 3 hours. How long will it take them to do the job if they work together. ( I know the answer is 5/6 hours, just need to know the solution) If 3 is subtrcted from four times a number, the result is 10 less than five times the number. Find the number.