Greenwich is an observatory in London England, assigned as the "starting point" for the time zones.
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GMT=Greenwich Mean Time
in earlier times time was measured by sandclock or waterclock
Mass divided by time, where the mass is measured in tons and the time is measured in hours. If the mass and time are measured in other units they will need to be converted to tons and hours.
The time is 4:40 - I'll leave the calculations up to you !
No - because time is measured in seconds, not linear distance.