250 miles = 402,336 meters.
2500000
250 miles is 402.336km
250 micrometres = 0.00025 metres.
ISMB equals 1000per meter.
250mm = 25cm = 0.25m
1/4 meter 1 meter = 1000 millimeters 1 millimeter = 0.001 meter
50 miles = 80,467.2 meters.
4000 meters = 2.485 miles.
250 million miles = 402.336 million km
About 250 miles.
A plane doesn't move "at 250 miles"; probably you mean "miles per hour". Convert that to meter/second, then multiply the mass with the speed.
About 0.4 square miles.