P-45 км
1 сторона-50минут 
за1 ч-?км

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рад помочь)

это хорошо

Р=45 ⇒ 1 сторона = 11,25 км50 мин = 5/6 часаскорость V=s : t = 11.25 : 5/6 = 11.25*6:5=13.5 км/чЗначит за 1 час проедет 13,5 км.