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After the field trip to a science museum, two schoolgirls were riding the light rail train back from the downtown to their suburb station.
“I notice,“ one of the girls said, “the incoming trains, coming in the opposite direction, pass us every 5 minutes. What do you think - how many trains arrive in downtown from our suburb in an hour, given equal speeds in both directions?“
“12, of course!“ the other girl replied, “because 60 divided by 5 equals 12.“
The first girl did not agree.
What do you think, is it 12 trains an hour or a different number?