book Maths Puzzle Numerical Ability

Mr X spent 2.5 hrs biking up a mountain. Rested for 30 minutes. Biked down in 1.5 hrs. How far did Mr. X bike, if his rate of ascent was 3 km/hr less than his rate of decent?

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book Other Question
problem: ax = bx + c
answer: x = c/(a,-b)
please break the problem down step by step to get the answer. y^2 – 5y + 25/4