Recently, the weather in the South China Sea is very bad. In order to prevent fishermen from catching boats, a certain unit of our navy was ordered to carry out disaster prevention and rescue missions

Recently, the weather in the South China Sea is very bad. In order to prevent fishermen from catching boats, a certain unit of our navy was ordered to carry out disaster prevention and rescue missions in the South China Sea. One day, I

With point b as BD⊥AC in d,

According to the meaning of the question, EC⊥AC, FA⊥AC, ∠ ECB = 60, ∠ Fab = 45,

∴∠BCD=30，∠BAD=45，

In Rt△ABD, AB=20 (nautical miles),

∴BD=AB？ Sin 45 = 20× 22 = 102 (in the sea),

In Rt△BCD, BCD = 30,

∴ BC = 2×10 2 = 20 2 ≈ 28 (in the sea),

It takes 28 to 60 hours for the fishing boat to reach the position C where the merchant ship is located.

∴ 28 60 ×60=28 (minutes),

A: It takes about 28 minutes for the fishing boat to reach the position C where the fishing boat is located.