Answers by visitors named: Laguna

As the train is travelling at 40 Miles per hour, in two minutes it will travel: 40 / 60 * 2 = 1.333 Miles. There are 5280 feet in one mile, so that would make the train: 5280 * 1.334 = 7040 feet long The cars are 50 feet long each, so that would make the train have: 7040 / 50 = 140.8 Cars Long.

I would say that #1 is correct, the singular 'is' refers to the singular checklist and the plural 'some' refers to the plural tips.