Question: An ocean fishing boat is drifting just above a school of tuna on a foggy day. Without warning, an engine back-fire occurs on another boat

An ocean fishing boat is drifting just above a school of tuna on a foggy day. Without warning, an engine back-fire occurs on another boat 1.0 km away (Fig. 12-33). How much time elapses before the backfire is heard
(a) By the fist, and
(b) By the fisherman?

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