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SUBMIT YOUR IDEASeems like my 'Input' and 'Output' files are not the same in terms of the times used for the calculation. But I checked my solution with the 'Output' file also and got the correct answer. I'm sure I'm not the only one who commented on this, however I have not read any of the other comments myself.
I managed to achieve this this just one tool, though of course needed more than one formula!