book Maths Puzzle Numerical Ability

Which of the following cannot be considered a probability of an outcome? 0 23% 115% 1

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Could you please explain how to solve this equation:
a
--- . a =/= 0
a

Thank you! it takes a passanger train 2 hous less time than it takes a freight train to make the trip from central city to clear creek. the passenger train averages 96 km/h while the freight train averages 64 km/h. How far is it from central city to clear creek?