A boatman rows 1 km in 5 minutes, along the stream and 6 km in 1 hour against the stream. The speed of the strean is :
[A] 12 km/hr
[B] 10 km/hr
[C] 6 km/hr
[D] 3 km/hr

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This question is part of UPSC Prelims Practice and Mock Tests membership programme.