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: j is faster than p. j and p each walk 24 km. sum ofthe speeds of j and p is 7 kmph. sum of time taken by them is 14 hours. then j speed is equal to ?
Options: a. 4, b. 5, c. 6, d. 7, e. 8
[A]: a

[Q]: Problem: two trains of equal are running on parallel lines in the same direction at 45 km / hr and 36 km / hr. the faster train passes the slower train in 36 sec. the length of each train is ?
Options: a. 45, b. 88, c. 66, d. 55, e. 22
[A]: a

[Q]: Problem: find the area of trapezium whose parallel sides are 20 cm and 18 cm long, and the distance between them is 14 cm.
Options: a. 335 cm 2, b. 885 cm 2, c. 285 cm 2, d. 825 cm 2, e. 266 cm 2
[A]:
e