Math Riddle: Two schoolgirls were traveling from the city to a dacha (summer cottage) on an electric train.
“I notice,” one of the girls said “that the dacha trains coming in the opposite direction pass us every 5 minutes. What do you think-how many dacha trains arrive in the city in an hour, given equal speeds in both directions?”
“Twelve, of course,” the other girl answered, “because 60 divided by 5 equals 12.”
The first girl did not agree. What do you think?
Answer: The correct answer is on the off chance that the young ladies had been on a standing train, the main young lady’s figurings would have been right, however, their train was moving. It took 5 minutes to meet a subsequent train, however, then it took the second train 5 additional minutes to arrive at where the young ladies met the principal train.
So the time between trains is 10 minutes, not 5, and just 6 trains for each hour show up in the city.