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.

Input: Consider Input: Question: Pipe A can fill a tank in 16 minutes and pipe B cam empty it in 24 minutes. If both the pipes are opened together after how many minutes should pipe B be closed, so that the tank is filled in 30 minutes?

Option A: 20

Option B: 16

Option C: 24

Option D: 28

Option E: 21

Output: Option E

Input: Consider Input: Question: which no. need to add to 859622 to get a number exactly divisible by 456?

Option A: 345652

Option B: 547678

Option C: 356789

Option D: 778990

Option E: 859622

Output: Option E

Input: Consider Input: Question: Liam is pulled over for speeding just as he is arriving at work.He explains to the police officer that he could not afford to be late today, and has arrived at work only four minutes before he is to start. The officer explains that if Liam had driven 5mph slower for his whole commute, he would have arrived at work exactly on time. If Liam's commute is 20 miles long,how fast was he actually driving?(Assume that Liam drove at a constant speed for the duration of his commute.)

Option A: 40 mph

Option B: 45 mph

Option C: 48 mph

Option D: 52 mph

Option E: 60 mph
Output: Option A