Answer
$2\sqrt {15}$
Work Step by Step
Step 1: $\sqrt 6\times\sqrt {10}$
Step 2: $\sqrt {6\times10}$
Step 3: $\sqrt {60}$
Step 4: $\sqrt {4\times15}$
Step 5: $\sqrt 4\times\sqrt {15}$
Step 6: $2\times\sqrt {15}$
Step 7: $2\sqrt {15}$
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