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.

[Q]: Question: A train covers a distance of 12 km in 10 min. If it takes 10 sec to pass a telegraph post, then the length of the train is?

 Option A: 100

 Option B: 110

 Option C: 200

 Option D: 130

 Option E: 140
[A]: Option C


[Q]: Question: If it takes 4 identical printing presses exactly 4 hours to print 8,000 newspapers, how long would it take 2 of these presses to print 6,000 newspapers?

 Option A: 6 hours

 Option B: 8 hours

 Option C: 7 hours

 Option D: 5 hours

 Option E: 9 hours
[A]: Option A


[Q]: Question: The average age of boys in a class is 16 years and that of the girls is 15 years. What is the average age for the whole class?

 Option A: 15

 Option B: 16

 Option C: 15.5

 Option D: Insufficient Data

 Option E: 17
[A]:
Option D