Find the speed of the stream — task. Mathematics State Board, Class 10.

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Answer variants:

$2 km / hr$

$4 km / hr$

$5.5 km / hr$

$1 km / hr$

The boat's speed in still water is 9

$km/hr$ . It can move 21

$km$ upstream and 22

$km$ downstream in 5 hours. Calculate the speed of the stream.

The speed of the stream

$=$

.

$1$

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