The fourth runner must beat a time of 13.8 seconds for the total time to be less than 60 seconds
Time taken for the first three runners = 14.7seconds, 16.2seconds, 15.3seconds
Let the time spent by the 4th runner be x
Total time = 14.7 + 16.2 + 15.3 + x
Total time = 46.2 + x
Total time < 60
46.2 + x < 60
x < 60 - 46.2
x < 13.8
The fourth runner must beat a time of 13.8 seconds for the total time to be less than 60 seconds
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