a)
1 godzina (h) = 60 minut (min) = 3600 sekund (s)
25 min -> \frac{25}{60} =\frac{5}{12}h
1 s -> \frac{1}{3600}h
15 s -> \frac{15}{3600} =\frac{1}{240}h
b)
1 kilometr (km) = 1000 metrów (m) = 100000 centymetrów (cm)
200 m ->\frac{200}{1000}= \frac{2}{10}= \frac{1}{5}km
8 m ->\frac{8}{1000}= \frac{1}{125}km
125 cm ->\frac{125}{100000}= \frac{1}{800}km
1500 cm ->\frac{1500}{100000}= \frac{3}{200}km