Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.

Q: Problem: two trains, one from howrah to patna and the other from patna to howrah, start simultaneously. after they meet, the trains reach their destinations after 10 hours and 8 hours respectively. the ratio of their speeds is
Options: a. 4: 9, b. 4: 3, c. 4: 12, d. 4: 8, e. 4: 5

A: e
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Q: Problem: what will be the percentage increase in the area of the cube ' s surface if each of the cube ' s edges grows by 40 % ?
Options: a. 95 %, b. 90 %, c. 85 %, d. 96 %, e. 25 %

A: d
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Q: Problem: as a treat for her two crying children, a mother runs to the freezer in which she has 4 cherry ice pops, 3 orange ice pops, and 4 lemon - lime ice pops. if she chooses two at random to bring outside to the children, but realizes as she runs out the door that she can not bring them different flavors without one invariably being jealous of the other and getting even more upset, what is the probability that she has to return to the freezer to make sure that they each receive the same flavor ?
Options: a. 1 / 99, b. 1 / 6, c. 5 / 18, d. 13 / 18, e. 5 / 6

A:
a
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