5/8 of 64 km = 40 km
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384s2 - 150 = 6*(64s2 - 25) The term inside the brackets is a difference of two squares, so 6*(8s - 5)*(8s + 5)
64 km = 6400 m
64 km = 39.77 miles (approx)
Answer: 64 km/h = 39.7677 mph
6.4 miles = about 10.3 km (10.2998016 kilometers)