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: for each color copy, print shop x charges $ 1.20 and print shop y charges $ 1.70. how much greater is the charge for 40 color copies at print shop y than at print shop x ?
Options: a. $ 14, b. $ 16, c. $ 18, d. $ 20, e. $ 22
[A]: d

[Q]: Problem: a train 100 meters long completely crosses a 300 meters long bridge in 36 seconds. what is the speed of the train is ?
Options: a. 32 kmph, b. 76 kmph, c. 34 kmph, d. 43 kmph, e. 40 kmph
[A]: e

[Q]: Problem: a train is 360 meter long is running at a speed of 52 km / hour. in what time will it pass a bridge of 140 meter length.
Options: a. 24.62 seconds, b. 34.62 seconds, c. 44.62 seconds, d. 54.62 seconds, e. none of these
[A]:
b