The task is to generate the correct answer for a given math problem.

[EX Q]: Problem: jack and jill are marathon runners . jack can finish a marathon ( 42 km ) in 7 hours and jill can run a marathon in 4.2 hours . what is the ratio of their average running speed ? ( jack : jill )
[EX A]: 5 / 5

[EX Q]: Problem: a train 800 m long can cross a pole in 10 sec and then find the speed of the train ?
[EX A]: 28

[EX Q]: Problem: average between 2 sets of numbers is closer to the set with more no ' s ?
[EX A]:
80