Verified Answer :

youma

1km=1000m=1000000mm
118km/h=118000000 mm/h

taskmasters

We are given the speed of the car  at 118 km/h. To determine the speed in mm/h, we just need to convert the kilometer into millimeter. To do this, a conversion factor is needed. We know that,

1km=1000m
1000m = 1000000mm

Therefore,

118km/h=118000000 mm/h

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