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20m : 4m/min = 5 min
30m : 4m/min = 7, 5 min
1m : 4m/min = 0, 25 min
o,1km = 100m
100m : 4m/min = 25 min
c)
12cm : 3cm/s = 4 s
60cm : 3cm/s = 20 s
15m = 1500 cm
1500cm : 3cm/s = 500 s
0,3km = 30000 cm
30000cm : 3 cm/s = 10000 s