It is: 90/20 = 4.5 Klm per hour
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To calculate the speed at which an object travels, you can use the formula: speed = distance/time. In this case, the speed would be 90 km/3 hours = 30 km/h. This means that the object is traveling at a speed of 30 kilometers per hour.
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It's speed - which is 90 Km/h
An hour is a unit of time. A kilometre is a unit of distance. Without some comparitive unit of speed, the two units are incompatible.
about 150 km 1.5 hours x 100 km = 150 km