53.3 repeating kph
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Its speed is exactly 400 km per 7.5 hours.
To convert that into units with which you may be more familiar:
-- (53 and 1/3) km per hour
-- 33.14 miles per hour (rounded)
-- 89,079.8 furlongs per fortnight (rounded)
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Average speed = Distance/Time = 400 km /5 hours = 80 km per hour.
To convert kilometers to hours, you need to know the speed at which the distance is being covered. If you are traveling at a speed of 80 kilometers per hour, for example, then you would divide the distance (400 kilometers) by the speed (80 kilometers per hour) to find that it would take 5 hours to cover that distance. So, in this case, 400 kilometers would be equivalent to 5 hours of travel time at a speed of 80 kilometers per hour.
a) Divide the kilometers by the hours, to get the speed in kilometers per hour. b) Divide this result by 3.6, to convert to meters/second.
400/5 = 80. HBD!
400 ÷ 20 = 20 hours (though it is unlikely that the speed would be constant!)