1 km = 1000 metres, 1 metre = 1000 millimetres so 1 km = 106 mm
So 275 km = 275*106 = 2.75*108 mm
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500 kilometers is equal to 500,000 meters.
500 centimeters = 0.005 kilometers
50 centimeters is larger than 500 millimeters. There are 10 millimeters in one centimeter, so 50 centimeters equals 500 millimeters.
500 centimeters is 5,000 millimeters.
500 miles is 804.672km