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: A man took a loan at rate of 12% per annum simple interest. After 3 years he had to pay 4320 interest. The principal amount borrowed by him was.

 Option A: Rs 14000

 Option B: Rs 15000

 Option C: Rs 12000

 Option D: Rs 17000

 Option E: None of these
[EX A]: Option C

[EX Q]: Question: Car ‘X’ covers a distance of 385 kms in 7 hours and car ‘Y’ covers a distance of 715 kms in 13 hrs. What is the difference in the speed of the two cars?

 Option A: 2kms/hr

 Option B: 1km/hr

 Option C: 3kms/hr

 Option D: 5kms/hr

 Option E: None of these
[EX A]: Option E

[EX Q]: Question: If x represents the sum of the interior angles of a triangle and y represents the sum of the interior angles of a regular pentagon, then the addition x and y is equal to the sum of the interior angles of what geometric shape?

 Option A: Hexagon

 Option B: Square

 Option C: Rhombus

 Option D: Trapezoid

 Option E: Pentagon
[EX A]:
Option A