Regula de 3 simpla
6,3 lei .....100 km
x------------23 km
x=6,3 x 23 : 100 = 144,9 : 100 = 1,449 lei ≅ 1,45 lei
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1 ora..........55 km
y -------------23 km
y=23/55= 0,4(18) ore = 418-4 / 990 = 414/990 = 207/495
1 ora...............3600 sec
207/495 ore......z
z=207*3600/495 = 745200/495 ≅ 1505,45 sec ≅ 1505/60 ≅ 25,09 min ≅ 25 min.
