tolong dijawab nomor 17&18

no 2 jwbn C. (11.10-08.40)=2,5 jam jadi 180÷2,5=72 km/jam

17. -2 kayu [tex]= 2.36 dm^{2} = 72 dm^{2} = 7200 cm^{2} [/tex]
-1 kayu = 7200 [tex] cm^{2} [/tex]
-1 kayu = [tex] 43 dm^{2} + 20 cm^{2} [/tex] = [tex]4300 cm^{2} + 20 cm^{2} = 4320 cm^{2} [/tex]

jadi [tex]7200+7200+4320 = 18.720 [/tex]

18. 08.40 sampai 11.10 = 2 jam 30 menit, berati 2,5 jam
v rata-rata = 180 : 2,5 = 72 km/jam

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