A daily train is to be introduced between station A and station B starting from each end at 6 AM and...........

Math and Mental Ability Time & distance

A daily train is to be introduced between station A and station B starting from each end at 6 AM and the journey is to be completed in 42 hours. What is the number of trains needed in order to maintain the Shuttle Service?

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Explanation:

Journey takes 42 hours (1 day and 18 hours). So a train starting at 6 AM from one end can take return journey on third day 6 AM from other end.
Hence two trains each will required from each end is a daily service is required.
Hence total number of trains required will be 4.