n1=c/v1 n2=c/v2
v1=s1/t v2=s2/t
n1/n2=s2/s1=30/20=1.5
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n1=c/v1 n2=c/v2
v1=s1/t v2=s2/t
n1/n2=s2/s1=30/20=1.5
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