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John Watson Time Puzzle

John Watson Time Puzzle - 15 October

The train leaves from New York City every 40 minutes from Boardman station. A man told John Watson that the train had left 15 minutes ago and the next train to New York City will leave at 9:40 p.m. At what time, man convey this information to John Watson?

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  1. Hope the question says every 40 min, it means 9 to 9.40 a train and next 40 min will be 10.20 and next 40 min will be of 11.00. If the question says 40 min in an hour 8.15 is the answer. But the question means for every 40 min. Can anyone make me clear in this