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A boatman rows at a place 45 km distant and back in 20 hours. He finds that he can row 12 km with the stream in the same time as 4 km against the stream. Find the speed of stream.
3 km/hr
2.5 km/hr
4 km/hr
Cannot be determined
Ratio of time taken for up and down =3:1 Out of 20 hr he took 15 hr for up and 5 for down. Speed up = 45/15 = 3
and down = 45/5 =9
Hence speed of stream =(9−3)×(1/2) = 3 km/h
Hence, option 1 is the correct answer.
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