A boat's speed in still water is 9 km/h and the stream flows at 1 km/h. The boat goes 60 km downstream. How…

Boats and Streams · Quantitative Aptitude · Medium · Practice for SSC CGL Tier 1

A boat's speed in still water is 9 km/h and the stream flows at 1 km/h. The boat goes 60 km downstream. How long will the return trip upstream take?

  1. 10.5 hours
  2. 7.5 hours
  3. 6 hours
  4. 11.5 hours
Answer and solution

Correct answer: B) 7.5 hours

Upstream speed = 9 − 1 = 8 km/h; time = 60/8 = 7.5 hours.

Learn the method: Boats and Streams rules and worked examples · SSC CGL Tier 1 Quantitative Aptitude

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