About 28 hours.
2100/70 = 30 hours
150 hours
23.33333 hours
24.7058 hours
1.46 days.
Time = Distance/Speed = 2100 miles / 85 mph = 24.71 hours.
32 hours 18.5 minutes.
-- If those miles are nautical ones, then it will take 4days 20hours 40minutes. -- If they're statute miles, then it will take 4days 5hours 22minutes 50seconds. (rounded)
Not enough information has been given to answer the question. How fast is the helicopter going per mile?
21 hours.
60 minutes divided by 70 equals .86 times 30 equals 25.7 minutes.
504 / 65 = 7.75 hours, which equals 7 hours and 45 minutes.