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ibps-rrb-os1 2020 · Question 57 of 176

A man can row at a speed of 24 km/hr in still water to a certain upstream point and back to the starting point in a river which flows at 15 km/hr. Find his average speed for total journey. IBPS RRB Scale I Officer 2020 Mains Previous Year Paper

Average

  1. A13.5 km/hr
  2. B7 km/hr
  3. C12.8 km/hr
  4. D14.625 km/hrCorrect
  5. E21.875 km/hr

Answer: D. 14.625 km/hr

Explanation

Speed of the man in still water = 24 km/hr Speed of the stream = 15 km/hr Speed downstream = (24 + 15) = 39 km/hr Speed upstream = (24 -15) = 9 km/hr Average speed = (Speed downstream x Speed upstream)/Speed in still water = (39 x 9)/24 = 14.625 km/hr

Source: IBPS RRB PO (Scale 1) Officer 2020 Mains Previous Year Paper — Answer Key & Detailed Solutions (memory-based compilation, ixamBee) · memory-based

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