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.

[EX Q]: Problem: a train 510 m long is running at a speed of 45 km / hr. in what time will it pass a bridge 140 m long ?
Options: a. 40, b. 52, c. 26, d. 21, e. 14
[EX A]: b

[EX Q]: Problem: a can give b 50 meters start and c 100 meters start in a kilometer race. how much start can b give c in a kilometer race ?
Options: a. 111.12, b. 111.67, c. 111.64, d. 52.63, e. 101.12
[EX A]: d

[EX Q]: Problem: if the speed of a man is 63 km per hour, then what is the distance traveled by him in 25 seconds ?
Options: a. 275 m, b. 360 m, c. 375 m, d. 437.5 m, e. 440 m
[EX A]:
d