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1/4 jam = x km/jam
dikali silang (dibalik karena logikanya, semakin sedikit waktunya, maka kecepatannya akan semakin besar)
1/3 . 15 = 1/4 . x
5 = 1/4 . x
x = 20 km /jam
t2 = 15 mnt = 0,25 jam
v1 = 15 km/jam
v2 = ?
jwb:
v1.t1 = v2.t2
15 x 0,3 = v2 x 0,25
4,5 = 0,25 v2
v2 = 4,5/0,25 = 18 km/jam