It is not possible to answer this question without more information. What are the units for 165? Miles per hour? Inches per second? Centimetres per year?
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If one's speed changes from 10 km/h to 6 km/h, one has decelerated.
1 km/h is 0.621371192 mph
307.4 km/h
40% decrease
t = s/v s = 15 km v = 100 km/h t = 15 km/(100 km/h) = 0,15 h = 9 minutes.