The conversation between human and AI assistant.
[|Human|] Based on this paragraph on Japanese bullet trains, how many cars do the longest trains have?
[|AI|] Based on this paragraph, the longest Japanese bullets trains have 16 cars, which is determined by dividing the length of the longes trains (400m) by the length of each car (25m).
[|Human|] 
Based on this paragraph on Japanese bullet trains, how many cars do the longest trains have?