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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. ?
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- 8 km/h
- 9.5 km/h
- 9 km/h
- 6. 25 km/h
Correct Option: A
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
