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un vapor parcurge 450 km in 10 ore . ce distanta va parcurge vaporul in 2 ore ? dar in 5 ore ?

Răspuns :

In 5 ore = 250 km
In 2 ore=100 km  adica 125-25=100 km
450 km...........10 ore
x ....................2 ore
x = 450* 2/10 = 900/10 = 90 km
450 km..................10 ore
x ...........................5 ore
x = 450 * 5/10 = 2250/10 = 225 km