The weather in the South China Sea tomorrow

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△

The weather in the South China Sea tomorrow

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.