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: How many seconds will a train 250 meters long take to cross a platform 200 meters long if the speed of the train is 90 kmph?

 Option A: 18 sec

 Option B: 15 sec

 Option C: 21 sec

 Option D: 16 sec

 Option E: 20 sec

Option A