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 Input:
Question: A boat can travel with a speed of 25km/hr in still water. If the speed of the stream is 5km/hr, find the time taken by the boat to go 120km downstream.

Option A: 1 hr

Option B: 2 hrs

Option C: 3 hrs

Option D: 4 hrs

Option E: 5 hrs

Ex Output:
Option D

Ex Input:
Question: A leak in the bottom of a tank can empty the full tank in 6 hours. An inlet pipe fills water at the rate of 4 liters per minute. When the tank is full in inlet is opened and due to the leak the tank is empties in 8 hours. The capacity of the tank is?

Option A: 5768

Option B: 5760

Option C: 5762

Option D: 5766

Option E: 5712

Ex Output:
Option B

Ex Input:
Question: It costs $18 for the first 1/2 hour to rent a bike. After the first 1/2 hour it costs $10 per hour. If a certain customer uses the bike for 2 hours, how much will it cost him?

Option A: $12

Option B: $45

Option C: $33

Option D: $95

Option E: $30

Ex Output:
Option C