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Q. A motorboat, whose speed in 15 km/hr in still water goes 30 km downstream and comes back in a total of 4 hours 30 minutes. The speed of the stream (in km/hr) is:

  • (A) 4 km/hr
  • (B) 5 km/hr
  • (C) 6 km/hr
  • (D) 10 km/hr
  • Correct Answer - Option(B)
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  • Filed under category Math
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