Answer: [B]: " 1 cm : 50 m " .
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Explanation:
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6.3 cm / 315 m = 1 cm / ? m
To fill in the "?" (in "m") ;
Divide 315 by 6.3 ; to get: 50 m ,
So, the answer is: 1 cm: 50 m; which is answer choice: [B].
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