266,112 inches are in 4.2 miles.
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It depends on whether you mean 78 inches by 42 inches or 78 inches by 42 feet or miles or whatever.
42 centimeters = about 16.5 inches (16.5354331 inches)
42 inches = 3.5 feet.
42 centimeters=16.5354331 inches
42 millimeters = 1.65 inches.