320*1/4 = 80
3/4*84 = 63
15 2/5 - 1/7 = 15 14/35 - 5/35 = 15 9/35
13 1/2 : 2 1/4 = 27/2 * 4/9 = 6 km/h
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320*1/4 = 80
3/4*84 = 63
15 2/5 - 1/7 = 15 14/35 - 5/35 = 15 9/35
13 1/2 : 2 1/4 = 27/2 * 4/9 = 6 km/h