book Maths Puzzle Numerical Ability

Hi there, can you tell me how to convert 6.25% into a angle or degree?
i have to show a slope of 6.25% on a hill.
Thanks Kiri

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book Other Question

I can't figure this out. I'm thinking I have to write two equations, but I don't know what they need to be. please help!

Abigail has a credit card from Arctic Bank and anoth a boat travels 80km upstream and then returns to its starting point. The entire trip takes 3.6h. if the speed of the current is 10km/h, determine the speed of the boat in still water.