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Old 2nd April 2006, 09:16 AM   #1
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Default Small question about boats and rivers

Hereís one for the math heads.
I didnít solve it but according to a friend, itís doable.


Two ferry boats (A and B) operate on a river. Both boats have different (but constant) speeds.
At a given time they start off together at opposite sides of the river and meet 155m from the side where B started.
When they reach the other side both need to wait the reglementary 12 minutes before (each at their own time now) they can start crossing over again. During this second crossing they meet at 85m from the side where B took it's second start.


How wide is the river?

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Old 2nd April 2006, 08:02 PM   #2
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The river is 380 meters wide.
The speed of boat A is 45/31 times the speed of boat B.
There is not enough information to determine the speeds of the boats.
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Old 16th May 2006, 12:56 AM   #3
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Anybody want to confirm?
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