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: Running at the same constant rate, 8 identical machines can produce a total of 240 pens per minute. At this rate, how many pens could 5 such machines produce in 5 minutes?

 Option A:  114

 Option B:  108

 Option C:  192

 Option D:  750

 Option E:  777
Option D

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
Option E

Question: Machine R takes 2 more hours than machine B to make 20 widgets. If working together, the machines can make 25 widgets in 3 hours, how long will it take machine R to make 40 widgets?

 Option A:  5

 Option B:  6

 Option C:  8

 Option D:  10

 Option E:  12

Option E