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: what is the probability of getting a queen or spade from a set of cards ?
Options: a. 3 / 13, b. 4 / 13, c. 5 / 13, d. 6 / 13, e. 7 / 13
[A]: b


[Q]: Problem: bob wants to run a mile in the same time as his sister. if bob ’ s time for a mile is currently 11 minutes 20 seconds and his sister ’ s time is currently 9 minutes 36 seconds, by what percent does bob need to improve his time in order run a mile in the same time as his sister ?
Options: a. 3 %, b. 5 %, c. 8 %, d. 10 %, e. 15 %
[A]: e


[Q]: Problem: when a stone is dropped from a building 200 m high, its speed is proportional to the time elapsed after dropping. the distance traveled is proportional to the square of the time elapsed. after 1 second the speed of the train was 10 m / sec and it was 190 m above the ground. when its speed is 25 m / sec, what would be its distance from the ground ?
Options: a. 140 m, b. 137.5 m, c. 125.75 m, d. 142.5 m, e. 152.5 m
[A]:
b