Question 524164
You could use proportions...
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1.6/1.5 = x/90
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90*1.6 = 1.5x
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1.5x = 90*1.6
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1.5x = 144
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x = 144/1.5 = 96 miles
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OR
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You could determine the miles per 10th of an inch and then multiply
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1.5 in. = 15 tenths
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We want to know how many miles per tenth of an inch.
So, we divide 90 miles / 15 tenths.
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6 miles/tenth of an inch
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1.6 inches = 16 tenths of an inch
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6*16 = 96 miles
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Done.