15 km = cm = mm; 3.2 μ M = m; 880 mm = nm; 250 L = cm2; 0.5 m3 = cubic decimeter = cubic centimeter; 3 hours = seconds = minutes

15 km = 1500000 cm = 15000000 mm
3.2 μ M = 3.2e-6m
880 mm = 880 million NM
250 L = 250000 CC
0.5 m3 = 500 cubic decimeter = 500000 cubic centimeter
3 hours = 10800 seconds = 180 minutes

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