bonjour
1. temps = distance : vitesse
temps = 1.5 * 10 ⁸ : 3 x 10 ⁵ = 0.5 * 10 ³ = 500 s = 8 min 20 s
2. distance = vitesse x temps
distance = 3 * 10 ⁵ x ≅ 4.16 = 12.48 * 10 ⁵ = ≅ 1.248 * 10 ⁶ km
3. 1 AL = 3 * 10 ⁵ * 3 600 * 24 * 365 = 9.4608 * 10 ¹² km
39 734 100 000 000 = 3.9734 * 10 ¹³
3.9734 * 10 ¹³ : 9.4608 * 10 ¹²
= ≅ 0.42 * 10 AL
