Solved UPSC CDS/OTA Question
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Q · Boat and StreamEasy · 45s
A boat's speed in still water is 18 km/h and stream speed is 6 km/h. What is the ratio of time taken downstream to upstream for the same distance?
TopicBoat and Stream
Question Typemultiple choice
DifficultyEasy
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained — no skipped algebra.
Time ∝ 1/speed. Ratio = (u-v) : (u+v) = 12 : 24 = 1 : 2.
Final Answer: Option A — 1:2