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A fishing boat is drifting just above a school of tuna on a foggy day. Without warning, an engine backfire occurs on another boat d = 1.2 km away...

A fishing boat is drifting just above a school of tuna on a foggy day. Without warning, an engine backfire occurs on another boat d = 1.2 km away (see figure).

(a) How much time elapses before the backfire is heard by the fish?
s

(b) How much time elapses before the backfire is heard by the fishermen?
s

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