Odpowiedź:
[tex]\boxed{70\frac{m}{s} = 252\frac{km}{h}}[/tex]
Wyjaśnienie:
[tex]1 \ km = 1000 \ m\\\\1 \ m = \frac{1}{1000}m\\\\1 \ h = 3600 \ s\\\\1 \ s = \frac{1}{3600}s[/tex]
[tex]70\frac{m}{s} = 70\cdot\frac{\frac{1}{1000} \ km}{\frac{1}{3600} \ s} = 70\cdot3,6\frac{km}{h} = \boxed{252\frac{km}{h}}[/tex]