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.

Question: P is three times as fast as Q and working together, they can complete a work in 12 days. In how many days can Q alone complete the work?

Option A: 11 days

Option B: 16 days

Option C: 13 days

Option D: 15 days

Option E: 19 days
Option B

Question: A certain car dealership offers its newest model in ten exterior and six interior colors. If the ten interior colors are identical to the ten exterior colors, and the dealership sells every pair of colors except those that would result in a car with an identically colored interior and exterior, how many different color combinations are possible?

Option A: 45

Option B: 81

Option C: 90

Option D: 10!/2!

Option E: 36
Option E

Question: The lowest number which should be added to 11390 so that the sum is exactly divisible by 7, 9, 10 and 12 is:

Option A: 1010

Option B: 2210

Option C: 1250

Option D: 1210

Option E: 1110
Option D