Question

Obarca parcurge 840m in 20 de minute.Ce viteza are barca ,exprima in km/h?

Answer 1

$Viteza = \dfrac{distanta}{timp} \\ \\ \rightarrow 840m = 0,84 = \dfrac{84}{100}~km \\ \\ \rightarrow 20 minute = \dfrac{1}{3}h~~(ore) \\ \\ \\ \\ V = \dfrac{84}{100}\cdot 3 = \dfrac{252}{100} = \boxed{2,52~km/h}$

Answer 2

840 m -------- 20 minute

x m ------------ 60 minute

x = 840 x 60 : 20 = 2520 m

v = 2520 m / h = 2,52 Km/h