Charles C. answered 11/12/17
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Note: 1 m/h is equal to 1.609344 km/h.
Part 1) This is a ratio problem.
1/1.609344 = 5/x
X = 5*1.609344 / 1 = 8.04672 km/h.
This is approx 8.0 km/h (one decimal place)
Part 2) This is a distance problem.
Distance = speed * time
Distance = 1.609344 km/h * 4 h = 6.77376 km.
This is approx 6.8 km. (one decimal place)