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: a 270 metres long bullet train running at the speed of 120 kmph crosses another bullet train running in opposite direction at the speed of 80 kmph in 9 seconds. what is the length of the other bullet train ?
Options: a. 226, b. 230, c. 430, d. 310, e. 260
[A]: b


[Q]: Problem: in what time will a train 50 m long cross an electric pole, it its speed be 360 km / hr ?
Options: a. 0.25, b. 0.5, c. 1.5, d. 2.5, e. 3.5
[A]: b


[Q]: Problem: a train 120 m long is running at 60 kmph. in how much time will it pass a platform 240 m long ?
Options: a. 15.6 seconds, b. 24.6 seconds, c. 21.6 seconds, d. 30.6 seconds, e. 35.6 seconds
[A]:
c