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  9. Q42

CGPSC 2011 · Question 42 of 146

A person swims upstream 11 km and downstream 26 km, taking 5 hours each time. The velocity of the current of the river is (per hour)

Boats and Streams

  1. A1.5 kmCorrect
  2. B2 km
  3. C3 km
  4. D3.5 km

Answer: A. 1.5 km

Explanation

Upstream speed = 11/5 = 2.2 km/h, downstream = 26/5 = 5.2 km/h; current = (5.2 - 2.2)/2 = 1.5 km/h.

Source: CGPSC PCS Prelims 2011 GS Paper, solved paper via iasexamportal.com

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