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.

Example Input: Question: If the ratio of a to b is 2 to 3 and the ratio of b to c is 1 to 5, what is the ratio of a to c?

Option A: 4/15

Option B: 1/3

Option C: 2/15

Option D: 4/5

Option E: 7/6
Example Output: Option C

Example Input: Question: Two pipes A and B can fill a tank in 15 min and 20 min respectively. Both the pipes are opened together but after 4 min, pipe A is turned off. What is the total time required to fill the tank?

Option A: 14 min 19 sec

Option B: 14 min 42 sec

Option C: 14 min 20 sec

Option D: 14 min 40 sec

Option E: 14 min 10 sec
Example Output: Option D

Example Input: Question: How many seconds will a 400 metre long train take to cross a man running with a speed of 6 km/hr in the direction of the moving train if the speed of the train is 46 km/hr?

Option A: 25

Option B: 30

Option C: 40

Option D: 45

Option E: 36
Example Output:
Option E