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s = v x t
10 km /jam x 1/4 jam = 2,5 km
20 km /jam x 1/2 jam = 10 km
30 km /jam x 1/4 jam = 7,5 km
djumlah... jadi jarak tempuh = 20 km
> nyari kelajuan rata rata
= jarak total/waktu total = 20 km / 1/2 = 40 km/jam.... (ngawut ini aku .-.)