Distance travelled by train in x minutes is equal to 60fx feet as per given constant rate of f feet per second.
As given in the question,
Train travelled at a constant rate f feet per second
Let d be the distance travelled by train in x minutes
1 second =f feet
60 seconds = (60f) feet
1 minute = (60f) feet
x minutes = (60fx)feet
Therefore ,distance travelled by train in x minutes is equal to 60fx feet
as per given constant rate of f feet per second.
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