It is 40 mph
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10 miles.
The fish travelled 15 miles in 52 minutes.
(10/15) x (60 minutes per hour) = 40 minutes
If you go 2 miles in 5 mins and then 2 miles in 10 mins, you have gone 2 + 2 = 4 miles in 5 + 10 = 15 mins 60 min = 1 hours → 15 min = 15/60 hr = 1/4 hr speed = distance ÷ time → speed = 4 miles ÷ 1/4 hr = 4 × 4/1 mph = 16 mph.
You must drive at a speed of (16.9 miles) per (15 minutes), or 67.6 mph.