book Maths Puzzle Numerical Ability

a plane flies 465 miles with the wind and 345 miles against the wind in the same length of time. if the speed of the wind is 20 mph, find the speed of the plane in still air.

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book Other Question

One person can do a job in 2 hours, Another can do the job in 3 hours, how long will it take if they do the job together.

What is the formula to solve this type of question?
My attempts seem futile. My question says to simplify the radicals.

4 square root of 3+2 square root of 12

Could you help me? thanks!