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21. Example 4 – Spray Output – continued
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Since the unit of time is the same for litres per hour and hectares per hour, then for every and any unit of time we have a ratio of litres per hectare. This is like saying if I eat 4 scones per hour and 8 biscuits per hour then I eat 4 scones for every 8 biscuits.
The formula can be written as:
The formula often published ‘simplifies’ the  , i.e., 60 ÷ 0.1 = 600
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