Dana started at 10:00 from the point A to point B. These points are distant 12 km. Determine how fast Daniel went when the place B arrived at 11:54. Speed express in km/h.

Correct result:

v =  6.3158 km/h


s=12 t=(11+54/60)10=1910=1.9 v=s/t=12/1.9=12019=6.3158 km/h

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