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4 1/4kodi=85lembar
12lembar
200-85-12=103lembar.
27,5mpangkat2=2750dmpangkat2
869dmpangkat2
12ca=1200dmpangkat2
jadi,2750-869-1200=654dmpangkat2
J =6 km x 1000 = 6000 m
k = 300
w = j:k = 6000 : 300 =20 menit