Simplify $\frac{\sqrt{40\cdot9}}{\sqrt{49}}$.
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Simplify $\frac{\sqrt{40\cdot9}}{\sqrt{49}}$.
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
\frac{6\sqrt{10}}{7}
Simplify $\frac{\sqrt{40\cdot9}}{\sqrt{49}}$.
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