A swimmer's speed downstream is 11 km/h and speed of the stream is 1.5 km/h. Find the upstream speed of swimmer.?

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Accepted Answer

Rate of stream = ( Speed downstream - Speed upstream )/2 ⇒ 1.5 = (11 - Speed upstream)/2 ⇒ 11 - Speed upstream = 3 ∴ Speed upstream = 11 - 3 = 8 km/h

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