Solved UPSC CDS/OTA Question
A solved UPSC CDS/OTA PYQ — decoded step-by-step.
Solve it the standard way once — then learn the shortcut.
Q · Boat and StreamMedium · 45s
A man can row 30 km upstream and 44 km downstream in 10 hours. It is also known that he can row 40 km upstream and 55 km downstream in 13 hours. Find the speed of the man in still water.
TopicBoat and Stream
Question Typemultiple choice
DifficultyMedium
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained — no skipped algebra.
Let the speed of man and speed of stream be x and y km/hr respectively x > y.
Speed of man in upstream = (x – y) km/hr.
Speed of man in downstream = (x + y) km/hr
ATQ,
Final Answer: Option B — 6 km/h