MPH equals the miles driven, divided by the time it takes to drive those miles (units of time is hours, or minutes divided by 60).
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Please use the equation: distance = time x speed
28 kmh is 17.3984 mph
111.85 mph
74.5645431 mph
Distance equals rate times time. You're trying to solve an equation with two unknowns. You know the distance, you're trying to establish the time, but the time will vary according to the rate. At 34.96 mph, the trip will take sixty minutes. At 69.92 mph, the trip will take thirty minutes.