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The steamer going upstream would cover the distance between

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VP
VP
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Joined: 30 Jun 2008
Posts: 1033

Kudos [?]: 704 [0], given: 1

The steamer going upstream would cover the distance between [#permalink]

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New post 30 Oct 2008, 03:03
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The steamer going upstream would cover the distance between town A and town B in 4 hours and 30 minutes. The same steamer going downstream would cover the distance between the towns in 3 hours. How long would it take a raft moving at the speed of the current to float from town B to town A?

10 hours
12 hours
15 hours
18 hours
20 hours
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Kudos [?]: 704 [0], given: 1

SVP
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Joined: 17 Jun 2008
Posts: 1535

Kudos [?]: 279 [0], given: 0

Re: PS : Steamer [#permalink]

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New post 30 Oct 2008, 03:55
18.

If d is the distance between A and B, x speed of steamer and y speed of current, then
x - y = d/4.5
x + y = d/3

Solving for y, d/y = 18.

Kudos [?]: 279 [0], given: 0

Re: PS : Steamer   [#permalink] 30 Oct 2008, 03:55
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The steamer going upstream would cover the distance between

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