a boy can swim in still water at 4 5 km h but takes twice as long to s | Examsbook

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Q: A boy can swim in still water at 4.5 km/h, but takes twice as long to swim upstream than downstream. The speed of the stream is ?

1
1.8 kmph
2
2 kmph
3
2.2 kmph
4
1.5 kmph

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Answer : 4. "1.5 kmph"
Explanation :
Answer: D) 1.5 kmph Explanation: Speed of Boy is B = 4.5 kmph Let the speed of the stream is S = x kmph Then speed in Down Stream = 4.5 + x speed in Up Stream = 4.5 - x As the distance is same, => 4.5 + x = (4.5 - x)2 => 4.5 + x = 9 -2x 3x = 4.5 x = 1.5 kmph

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