a)
[tex]72 \frac{m}{min} = 72 \times \frac{100}{60} = \frac{7200}{60} = 120 \frac{cm}{s} [/tex]
b)
[tex]180 \frac{m}{s} = 180 \times \frac{ \frac{1}{1000} }{ \frac{1}{60} } = 180 \times \frac{1}{1000} \times 60 = 180 \times \frac{60}{1000} = 180 \times 0.06 = 10.8 \frac{km}{min} [/tex]
c)
[tex]720 \frac{km}{h} = 720 \times \frac{1000}{3600} = \frac{720000}{3600} = 200 \frac{m}{s} [/tex]
