Subject: General Aptitude · Chapter: Boats and Streams · Exam: 2006 · Marks: · Difficulty:
A boat takes 8 hours to cover a distance while travelling upstream, whereas while travelling downstream it takes 6 hours. If the speed of the current is 4 kmph, what is the speed of the boat in still water?
(a)12 kmph
(b)16 kmph
(c)28 kmph
(d)Cannot be determined
(e)None of these
Answer
Answer (as printed): C
Explanation
Let the speed of the boat in still water be $x$ kmph. Then, Speed downstream $=(x+4)$ kmph, Speed upstream $=(x-4)$ kmph. $(x+4)\times6=(x-4)\times8 \Rightarrow 6x+24=8x-32 \Rightarrow 2x=56 \Rightarrow x=28$ kmph.
Explanation as extracted from the printed page; notation may be imperfect.