Mariya was travelling in her boat when the wind blew her hat offf and the hat started floating back downstream. The boat continued to travel upstreamfor twelve more minutes before Mariya realized that her hat had fallen off and turned back downsteam. She caugth up with that as soon as it reached the starting point. Find the speed of river if Mariya’s hat flew off exactly 3 km from where she started:

1)5 km/h

2)6 km/h

3)7.5 km/h

4)can/t be determined

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    7.5 km/h

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