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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.?

8 km/h
9.5 km/h
9 km/h
6. 25 km/h

Correct Answer: 8 km/h

Explanation:

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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