Speed of a boat in still water is 12 kmph and speed of stream is 'x' kmph. If…
2020
Speed of a boat in still water is 12 kmph and speed of stream is 'x' kmph. If in traveling 270 km upstream boat takes 66⅔% more time than traveling 270 km downstream, then find the value of 'x'.
- A.
2 kmph
- B.
4 kmph
- C.
1 kmph
- D.
3 kmph
- E.
6 kmph
Attempted by 4 students.
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Correct answer: D
Upstream time is 66 2/3% more than downstream time, so upstream time = 5/3 of downstream time. Solving 270/(12-x) = (5/3) x 270/(12+x) gives x = 3 km/h.