and distance= speed*time
Time was calculated during ancient times in a few ways. Some Ancient people used the sun and others created calendars.
distance / time
The SI unit for time is the second (s).
Instanteneous travel time is calculated by combining the speed measurements in different locations at the departure time of a trip.
Impulse momentum theory: when force is applied to a rigid body it changes the momentum of the body. it is calculated with respect to time and also the velocity is calculated.
Velocity is displacement/time.
It can sometimes be calculated by the sun
Distance/Time
Local time can be calculated using a time zone chart and adding or subtracting hours from Greenwich Standard Time. There are also time zone converters online.
time
distance / time
it can be calculated at a particular instant as it is total displacement in given time
The SI unit for time is the second (s).
Acceleration.
Average speed is calculated by dividing the total distance covered divided by the time taken. Instantaneous speed is calculated as the derivative of displacement with respect to time.
The same way it is calculated for travel through any other medium. Distance divided by time.
Indian Standard Time is calculated with a time offset of UTC + 5:30. If it is midnight UTC, then it will be 5:30am IST (Indian Standard Time). Indian Standard Time also covers Sri Lanka and the islands of Lakshadweep.
velocity.