To convert 21 tablespoons per minute to teaspoons per hour, we need to follow these steps:
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Convert tablespoons to teaspoons:
There are 3 teaspoons in 1 tablespoon.\[ 21 \text{ tablespoons} = 21 \times 3 \text{ teaspoons} = 63 \text{ teaspoons} \]
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Convert minutes to hours:
There are 60 minutes in 1 hour.\[ \text{Rate in teaspoons per hour} = 63 \text{ teaspoons per minute} \times 60 \text{ minutes} = 3780 \text{ teaspoons per hour} \]
Thus, the equivalent rate is:
\[ 21 \text{ tablespoons per minute} = 3780 \text{ teaspoons per hour} \]