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21.
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A
boat covers a certain distance downstream in I hour, while it comes back in
1½ hours. If the speed of the stream be 3 kmph. what is the speed of the boat
in still Water?
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A. 12kmph
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B. 13kmph
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C.
15kmph
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D. 16kmph
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Answer:
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Let
the speed of the boat in still water be x kmph. Then,
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Speed
downsteram
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= (x
+ 3) kmph.
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Speed
upsteram
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= (x
- 3) kmph.
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=
(x+3)x1
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= (x
- 3)x3/2 kmph.
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=
2x+6 = 3x-9
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x=
15 kmph.
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Title : BOATS and STREAMS Q21
Description : 21. A boat covers a certain distance downstream in I hour, while it comes back in 1½ hours. If the speed of the strea...
Rating : 5
