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.

[EX Q]: Question: The compound ratio of 1:3, 3:2 and 4:5?

 Option A: 1:9

 Option B: 1:7

 Option C: 1:2

 Option D: 2:5

 Option E: 1:4
[EX A]: Option D

[EX Q]: Question: In how many seconds will a train 100 meters long pass an oak tree, if the speed of the train is 36 km/hr?

 Option A: 6

 Option B: 8

 Option C: 10

 Option D: 12

 Option E: 14
[EX A]: Option C

[EX Q]: Question: Find the value of y from (12)^3 x 6^ 4 ÷ 432 = y?

 Option A: 3456

 Option B: 4567

 Option C: 4789

 Option D: 5678

 Option E: y=5184
[EX A]:
Option E