.. A swimmer croses a flowing river of width d to and fro in time ty. The time taken to cover thesame distance up and down the stream is tz. IfIz is the time the swimmer would take to swima distance 2 d in still water, then prove that7 =23

.. A swimmer croses a flowing river of width d to and fro in time ty

1.	.. A swimmer croses a flowing river of width d to and fro in time ty. The time taken to cover thesame distance up and down the stream is tz. IfIz is the time the swimmer would take to swima distance 2 d in still water, then prove that7 =23
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.. A swimmer croses a flowing river of width d to and fro in time ty. The time taken to cover thesame distance up and down the stream is tz. IfIz is the time the swimmer would take to swima distance 2 d in still water, then prove that7 =23​

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.. A swimmer croses a flowing river of width d to and fro in time ty. The time taken to cover thesame distance up and down the stream is tz. IfIz is the time the swimmer would take to swima distance 2 d in still water, then prove that7 =23