bonjour
90 km/h = 90 000 : 3 600 = 25 m /s
120 km /h = 120 000 : 60 = 2 000 m / min
10 m / s = 0.010 x 3 600 = 36 km / h
32 kWh = 30 000 : 60 = 533.33 W / min
150 W h = 0.15 : 60 = 0.0025 kW/ min
135 W min = 0.135 x 60 = 8.1 kW /h
30 kg / m ³ = 30 000 g / m ³ = 30 000 000 g / dm ³
2 500 cg / cm ³ = 25 g / cm³ = 0.000025 g / m ³
15 t / km ³ = 15 000 kg / m ³