[tex]dane:\\s = 15 \ m\\v = 40\frac{km}{h} = 40\cdot\frac{1000 \ m}{3600 \ s} = \frac{100}{9} \ \frac{m}{s}\\szukane:\\t = ?\\\\Rozwiazanie\\\\s = v\cdot t \ \ /:v\\\\t = \frac{s}{v}\\\\t = \frac{15 \ m}{\frac{100}{9}\frac{m}{s}} = 1,35 \ s\\\\1,35 \ s = \frac{1,35}{60} \ min = 0,0225 \ min\\\\1,35 \ s = \frac{1,355}{3600} \ h = 0,000375 \ h\\\\t = 1,35 \ s = 0,0225 \ min = 0,000375 \ h[/tex]
