exam Maths Puzzle Numerical Ability

please help me:

the sum of the digits of a two-digit number is 12. if the digits are reversed, the new number is 15 more than twice the original number. what is the original number?

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exam Other Question

A motorboat travels 414km in 6 hours going upstream and 856km in 8 hours going downstream. What is the speed of the boat in still water, and what is the speed of the current? If two inlet pipes are both open, they can fill a pool in 1 hour and 12 minutes. One of the pipes can fill the pool itself in 2 hours. How long will it take the other pipe to fill the pool itself?