The unit rate of length is 1000. What is the unit of mass? What is their forward speed? Time, how do you say the three mathematical time formulas?
There are 1km = 1 ,000m, the unit propulsion rate is 1 ,000, the mass unit is (ton, kg, gram), and their propulsion rate is (1 ,000). The three time formulas of time and mathematics are: speed × time = distance; Distance/speed = time, distance/time = speed.