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It all depends upon which helicopter you mean: 1 knot ≈ 1.15 mph A Wessex helicopter had a max speed of 115 knots, meaning it could cover 93 miles in 93 ÷ (115 x 1.15) x 60 mins ≈ 42.16 mins A Wasp helicopter had a max speed of 120 knots, meaning it could cover 93 miles in 93 ÷ (120 x 1.15) x 60 mins ≈ 40.41 mins A Sea King helicopter had a max speed of 125 knots, meaning it could cover 93 miles in 93 ÷ (125 x 1.15) x 60 mins ≈ 38.79 mins A Lynx helicopter had a max speed of 160 knots, meaning it could cover 93 miles in 93 ÷ (160 x 1.15) x 60 mins ≈ 30.31 mins Those figures are from pre 1980. A Lynx in 1986 reached 249.1 mph, meaning it could cover 93 miles in 93 ÷ 249.1 x 60 mins ≈ 22.40 mins An unofficial record of 299 mph by a Sikorsky X2 (compound helicopter) in 2010 means it could cover 93 miles in 93 ÷ 299 x 60 mins ≈ 18.66 mins
3.5 hrs + 2 hrs + 10 minutes = 5 hours and 40 minutes = 5 hours and 2/3 hours Average speed = s / t =720 miles / (5 hours + 2/3 hours) =720 miles / (17/3 hours) = 127.06 miles/hours (approximation)
The answer looks like 1.0. At first I thought you were jacking with me, but I realized that all of the numbers before 30 minutes were always rounded down and all the numbers after 30 minutes were always rounded up, regardless of the remainder. Therefore, 55 mins and 1 hour will have the same number.
distance = speed x time 75 mins = 75 ÷ 60 hours = 1.25 hours distance = 70 mph x 1.25 hrs = 87.5 miles