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2 4/5=14/5×500=1400
4 1/4=17/4×20=85
2 1/3=7/3×12=28
jadi, 1400+85+28=1513
No.23
624km : 48km/jam = 13 jam
13.00 + 01.30= 14.30
17.40 + 14.30 = 08.10