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There's no proper reason. It was defined as such. Taking 1 as the denominator we can compare between two things easily like:

Two trains are moving with following parameters

  1. First moving 500 km in 7 hr
  2. Second moving 450 km in 6 hr
We have to determine who is faster...

Now at unit (means one) hour

  1. First train is moving (500/7)=71.42 km per hour
  2. Second train is moving (450/6)=75 km per hour
So clearly we can say that the 2nd train is faster.
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11y ago
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Q: Why is 1 the denominator of a unit rate?
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