Question 582674
60 min = 1 hour


1 min = 1/60 hour


40 min = 40/60 hour


40 min = 2/3 hour



So 1 hour and 40 minutes = 1 hr + 2/3 hr = 1 2/3 hr = 5/3 hr


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d = rt


1260 = r(5/3)


1260*3 = 5r


3780 = 5r


3780/5 = r


756 = r


r = 756



So the speed is 756 miles per hour