Definition: You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.
Input: Question: A train 125 m long passes a man, running at 5 km/hr in the same direction in which the train is going, in 10 seconds. The speed of the train is:

 Option A: 50 km/hr

 Option B: 15 km/hr

 Option C: 6 km/hr

 Option D: 8 km/hr

 Option E: 12 km/hr

Option A