Question

Doua automobile pornesc amandoua in acelasi timp la drum. Primul are 50/h , iar al doilea are cu 20% mai mult decat primul. Dupa 2 ore, cu cati km are mai mult cel de al doilea automobil? O explicație va rog

Answer 1

$v_1=50~km/h$
$v_2=120%\cdot50=\frac{120\cdot50}{100}=12\cdot5=60~km/h$
$t=2~h$
$d_1=t\cdot v_1=2\cdot50=100~km$
$d_2=t\cdot v_2=2\cdot60=120~km$
$120-100=\boxed{20~km}$

Answer 2

v₁ = 50 km/h
v₂ = 50 + 50 * 20/100 = 50 + 10 = 60 km/h
d₁ = 50 * 2 = 100 km
d₂ = 60 * 2 = 120 km
d₂ - d₁ = 120 - 100 = 20 km