Book Maths Puzzle Algebra

i was asked to formulate an equation for part of a crank shaft with a hight of 50mm and a diamiter of 25mm and solve this i did this with no problem no problem 50 x 25 + 0.785 x 25

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Im working with the pythagorean theorem how do you solve for c if a = 12 and b = 15 so far ive got to 12^2 + 15^2 = c squared A bullet train which is 40km/hr faster than the existing train will replace the existing train on an 850km journey. If the bullet train does the journey 3hours faster than the existing train, what are their speeds?