if you are not moving it is ∞ hours. If on the other hand you are moving with ∞ Km/h then that would be 0 hours.
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If 1 hour ===> 40 km, then 2 hours ===> 80 km.
Assuming "3 12" is meant to be 3 1/2 then it will be 28 km.
32 km/h
It is a rate. For instance, if the quantities are 10 km and 2 hours, then the ratio (10 km)/(2 hours) = 10/2 km/hour = 5 km/h, which is a rate of speed.
Speed = Distance/Time = 150 km / 2 hours = 75 km per hour.