exam Maths Puzzle Numerical Ability

It's on page 85.I just need someone to show me step by step how to get the answer.

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A passenger train can travel 325 mi in the same time a freight train takes to travel 200 mi. If the speed of the passenger train is 25 mi/h faster than the speed of the freight train, find the speed of each. WRite a 2 column proof of the following: in an isosceles triangle start at the vertex of each of the two bases and draw a segment to the midpoint of the opposite leg. Prove the se