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If it takes 42 minutes to load 3 1/2 trucks, how many minutes will it take to load 6 1/2 trucks?
Answer: 78 minutes
Explanation
Let x represent the number of minutes it takes to load 1 truck.
We know that it takes 42 minutes to load 3*1/2 trucks.
The time it takes to load 6*1/2 truck is then given by 6*1/2*x.
Thus it takes 78 minutes to load 6*1/2 trucks.
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