I think "away" here means "far". Why can't you use "far"? It's simply a matter of syntactics.
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stephenlearner1)How far is the wax museum?(reply) It is five miles away.I think "away" here means "far". Why can't you use "far"?It's simply a matter of syntactics. Far is used in negations and questions to talk about general distance in space or time. Away only works when talking about a specific distance.
AvangiHow far can you hear? I can hear 100 yards away. Your hearing is not bad. These are fine grammatically, but they ignore the fact that loudness is as much a factor as distance. "I can hear a pin drop a mile away."Thank you, Avangi. I admit it is an awkward sentence. I just considered the grammaticality, and forgot the reality.