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ibps-rrb-os1 2019 · Question 66 of 186

A man can row at a speed of 12 km/hr in still water to a certain upstream point and back to the starting point in a river which flows at 3 km/hr. Find his average speed for total journey.

Average

  1. A11.25 km/hrCorrect
  2. B18.75 km/hr
  3. C22.5 km/hr
  4. D7.5 km/hr
  5. E10.5 km/hr

Answer: A. 11.25 km/hr

Explanation

Speed of the man in still water = 12 km/hr Speed of the stream = 3 km/hr Speed downstream = (12 + 3) = 15 km/hr \Speed upstream = (12 -3) = 9 km/hr\ Average speed = (Speed downstream x Speed upstream)/Speed in still water = (15 x 9)/12 = 11.25 km/hr

Source: IBPS RRB PO (Scale 1) Officer 2019 Mains Previous Year Paper — Answer Key & Detailed Solutions (memory-based compilation, ixamBee) · memory-based

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