A train is travelling at a constant speed covers a distance of $320km$ in 6 hours $40$ minutes. The distance covered by the train in $1$ n hour $15$ minutes is

First convert the initial time entirely into minutes to get (6 hours times 60) plus 40, which equals 400 minutes. Using the direct proportion of speed, the distance covered in 75 minutes (1 hour 15 minutes) is (320 times 75) divided by 400. Multiplying this out gives the final distance as 60 km.

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