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Given,
We know that it take 42 minutes to load 3 ½ trucks.
Find out how many minutes will it take to load 6 ½ trucks?
We know that to Load 3 ½ trucks in 42 minutes
Then to load 1 truck in 42/3.5 minutes
Simplify, load 1 truck in 12 minutes
Then load 6 ½ trucks in 6.5 X 12 minutes
Simplify Load 6 ½ trucks in 78 minutes
Second,
\[\ \frac{42}{x}=\frac{3.5}{6.5} \]
\[\ x =\frac{6.5}{3.5} \times 42 \]
\[\ x =\frac{6.5}{3.5} \times 42 \]
\[\ x =\frac{13}{7} \times 42 \]
\[\ x = 13 \times 6 \]
\[\ x = 78 Minutes\]
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