Jawabanmu

2014-03-28T08:47:52+07:00
40m/s=40kali3600/jam
144000m/jam=144km/jam


2014-03-28T08:49:18+07:00
40 m/s = 40 x 3600/jam
            = 144000 m/jam
            = 144 Km/jam
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