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e = 1500 m *(1 km/1000 m) = 1.5 km
t = 40 min *(1 h/60 min) = 2/3 h
v = e/t
v = 1.5 km/(2/3)h
v = 1.5 km/h* (3/2)
v = 4.5/2
v = 2.25 km/h