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GMAT PREP - Tricky Rates Question

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by jnellaz » Mon Dec 01, 2008 10:32 am
https://www.beatthegmat.com/boat-traveled-t18353.html

And when you are finished understanding this problem, for kicks you may want to try this one :

A boat travels upstream in a river with a constant but unknown speed V with respect to water. At the start of this trip upstream, a bottle is dropped over the side. After 7.5 minutes the boat turns around and heads downstream. It catches up to the bottle when the bottle has driffted 1 km down stream from the point at which it was dropped into water. What is the velocity of the water current?

[spoiler]The velocity of water is 4 km/h.[/spoiler][spoiler]
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