Time = Distance/Speed = 139.8/42 = 3.3286 hours ie just under 3 hours 20 minutes.
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You cover 4.536 miles, and it makes no difference at all how long you take to do it.
A little under 9 minutes.
At 50 mph, after 60 mins you would have covered 50 miles. Therefore each minute you cover 50/60 = 0.8333333333333333 miles. Thus after 6 minutes you would have covered 6 * 0.8333333333333333 = 5 miles.
77/4.4 = 17.5 hours
You have been running for 2.5 hours.