book Maths Puzzle Numerical Ability

an airplane flew for 4 hours with a 15 mi/h tail wind. the return flight against the same wind took 5 hours. find the speed of the airplane in still air.

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Please help with this - we just can't figure it out - thanks
If Shelly gives John $5, they will have the same amount of money.
If John gives Shelly $5, she will have twice as muc if x= the sum of 9% of 21..then wut would the product of 23x equal if no quotient was present for no percentage?