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: Marge has 3 pumps for filling her swimming pool. When all 3 pumps work at their maximum rates, the swimming pool is filled in 66 minutes. Pump 1's maximum rate is twice the maximum rate of pump 2 and four times the maximum rate of pump 3. How long would it take Marge to fill the pool if she used only pump 3 at its maximum rate ?

 Option A: 2hrs, 48mins

 Option B: 6hrs, 32mins

 Option C: 7hrs, 12mins

 Option D: 13hrs, 4mins

 Option E: 7hrs, 42mins
[EX A]: Option E

[EX Q]: Question: A car traveled 75% of the way from Town A to Town B at an average speed of 75 mph. The car traveled at an average speed of v mph for the remaining part of the trip. The average speed for the entire trip was 50 mph. What is v in mph?

 Option A: 30

 Option B: 35

 Option C: 25

 Option D: 40

 Option E: 45
[EX A]: Option C

[EX Q]: Question: What is the solution of the equations x - y = 0.9 and 11(x + y)-1 = 2 ?

 Option A: x = 3.2, y = 2.3

 Option B: x = 1, y = 0.1

 Option C: x = 2, y = 1.1

 Option D: x = 1.2, y = 0.3

 Option E: None
[EX A]:
Option A