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: In what time will a train 200 m long cross an electric pole, it its speed be 144 km/hr?

 Option A: 2 sec

 Option B: 2.7 sec

 Option C: 3.5 sec

 Option D: 5 sec

 Option E: 9.5 sec
[EX A]: Option D

[EX Q]: Question: John left home and drove at the rate of 45 mph for 2 hours. He stopped for lunch then drove for another 3 hours at the rate of 45 mph to reach his destination. How many miles did John drive?

 Option A: 235 miles.

 Option B: 245 miles.

 Option C: 225 miles.

 Option D: 265 miles.

 Option E: 275 miles.
[EX A]: Option C

[EX Q]: Question: Mohan ranks twenty-first in a class of sixty-five students. What will be his (Mohan's)rank if the lowest candidate is assigned rank 1?

 Option A: 44th

 Option B: 45th

 Option C: 46th

 Option D: Data inadequate

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