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: Two pipes P and Q can fill a cistern in 12 and 14 minutes respectively. Both are opened together, but at the end of 3 minutes the first is turned off. How much longer will the cistern take to fill?

Option A: 11 1/2 min

Option B: 11 1/4 min

Option C: 11 2/4 min

Option D: 11 1/5 min

Option E: 10 1/2 min
[EX A]: Option E

[EX Q]: Question: The ratio between the number of passengers travelling by I and II class between the two railway stations is 1 : 50, whereas the ratio of I and II class fares between the same stations is 3 : 1. If on a particular day Rs. 1,325 were collected from the passengers travelling between these stations, then what was the amount collected from the II class passengers?

Option A: Rs. 750

Option B: Rs. 1000

Option C: Rs. 850

Option D: Rs. 1250

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

[EX Q]: Question: A crew can row a certain course up the stream in 84 minutes; they can row the same course down stream in 6 minutes less than they can row it in still water. How long would they take to row down with the stream

Option A: 45 or 23 minutes

Option B: 63 or 12 minutes

Option C: 78 minutes

Option D: 19 minutes

Option E: 25 minutes
[EX A]:
Option C