First you must realize that when talking about how fast something is, you must take into account speed:
S=d/t
while velocity = S in a direction.
As to how fast you are going, there is no way to tell. you have 2 variables that have no actual value here in a 3 variable question, so:
Speed = 156 Kilometers * Time
Without the time variable, the speed can be of infinite answers.
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Answer: 156 km/h = 97 mph
1knot = 1.852 km per hour.
75 miles = 120.7 km (rounded)
162,5 mph
Not fast at all. 75 km is a distance, not a speed. However if it was 75 kilometers per hour, it's 46.6 mph.