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: Consider Input: Question: A bus takes 3 hours to cover a distance of 500 Km. how much should the speed in Kmph be maintained to cover the same direction in 5/3th of the previous time?

Option A: 75 Kmph

Option B: 100 Kmph

Option C: 90 Kmph

Option D: 65 Kmph

Option E: 70 Kmph

Output: Option B

Input: Consider Input: Question: The total of the ages of Amar, Akbar and Anthony is 30 years. What was the total of their ages three years ago ?

Option A: 20 years

Option B: 28 years

Option C: 71 years

Option D: 21 years

Option E: 31 years

Output: Option D

Input: Consider Input: Question: In what ratio tea of Rs.80 per kg be mixed with 12kg tea of Rs.64 per kg, so thai cost price of mixture is Rs.74 per kg?

Option A: 3:5

Option B: 5:3

Option C: 2:5

Option D: 2:3

Option E: None of the above
Output: Option B