Answer:
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T₁ = 4 min (60 s / 1 min) (1 hr / 3600 s) = 0.06666 hr
t₂ = 10 min (60 s / 1 min) (1 hr / 3600 s) = 0.1666 hr
d₁ = v₁ t₁ = (6 km / hr) ( 0.06666 hr) = 0.39996 km
d₂ = v₂ t₂ = ( 4 km / hr)(0.1666 hr) = 0.6664 km
v = d₁ + d₂ / v₁ + v₂ = (0.39996 + 0.6664) km / (0.06666 + 0.1666) hr =
v = 1.06636 km / 0.23326 hr = 4.571 m / s
En el año 1492, que coincidentemente es el año en el que los Europeos llegaron a las Américas.
Hope it helped,
BioTeacher101