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You might be in good condition but what about the road condition (wet, icy), the state of you tyres (good tread or worn), the state of your brakes?
40 mph = 40 miles in 60 minutes = 20 miles in 30 minutes.
Just divide the distance by the speed.
Distance = Rate * Time or, for our purpose Time = Distance/Rate at 50 mph Time = 4.5 miles/50 mph = 0.09 hours = 5.4 minutes ----------------------------- at 40 mph Time = 4.5 miles/40 mph = 0.1125 hours = 6.75 minutes ---------------------------------------------------- 6.75 - 5.4 = 1.35 minutes saved
Driving at 40 mph for 50 minutes would mean covering a distance of: 40 x 50/60 = 33 1/3 miles.