Book Maths Puzzle Time Distance and Speed

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?

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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 What is the longest line you can draw a ruler on a piece of paper 20cm by 30cm?