Strictly speaking, when giving measurements, fractions are not always the same as decimals. If I said something is 50.5 foot long that implies I could also measure it if it were 50.4 or 50.6 foot long. If I said it is 50 ½ foot long, that means I could only measure it to the nearest ½ foot. It’s the same with old athletics records, they would often use 1/5th of a second as the time could be measured only to that accuracy. If a time were recorded as 10.2 seconds rather than 10 1/5th seconds, the former implies it could be measured to nearest 0.1 seconds.