Question

Urgent !!
Dau coroana

Answer 1

21000 $\frac{kg}{m^{3} }$ = 21.000.000 $\frac{g}{1.000.000c^{3} }$ = 21 $\frac{g}{cm^{3} }$

72 $\frac{km}{h}$ = 72000 $\frac{m}{3600 s}$ = 20 $\frac{m}{s}$

7h 33 min = 7x3600 + 33x60 = 27.180 s