Off the coast of Chile, a spotter plane sees a school of tuna swimming at a steady 5 km/h northwest (Figure). The pilot informs a fishing trawler located 100 km due south of the fish. The trawler sails at full steam along the best straight-line course and intercepts the tuna after 4 h. How fast did the trawler move?

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5 km/h 100 km z4