Hello!
We have the following data:
Lupu Bridge (China) = 12,795 feet long
Hart Bridge (USA) = 3,845 feet long
Let's divide the largest length by the shortest length, so we'll know how many times the Lupu Bridge is bigger than the Hart bridge, let's see:
[tex]\dfrac{12,795}{3,845} \:\:\boxed{\boxed{\approx 3,3\:longer}}\end{array}}\qquad\checkmark[/tex]
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I Hope this helps, greetings ... DexteR! =)