Boats and Streams
- A boat goes 14 km upstream in 56 minutes. The speed of stream is 2 km/hr. The speed of boat in still water is ?
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∵ Speed upstream = 14 x (60/56) = 15 km/hr
Speed in upstream = Speed in still water - Speed of stream.Correct Option: D
∵ Speed upstream = 14 x (60/56) = 15 km/hr
Speed in upstream = Speed in still water - Speed of stream.
⇒ x - 2 = 15
∴ x = 17 km/hr
- The speed of a boat in still water is 2 km/hr. If its speed upstream be 1 km/hr, then speed of the stream is ?
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Speed in upstream = Speed in still water - Speed of stream.
∵ 1 = 2 - xCorrect Option: C
Speed in upstream = Speed in still water - Speed of stream.
∵ 1 = 2 - x
∴ x = 2 - 1 = 1 km/hr
- A man can row with the stream at 11 km/hr and against the stream at 8 km/hr. The speed of the stream is ?
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Speed of stream = (11 - 8)/2 km/hr
Correct Option: C
Speed of stream = (11 - 8)/2 km/hr = 1.5 km/hr
- A man can row downstream at 14 km/hr and upstream at 9km/hr. Man's rate in still water is ?
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Man's rate in still water = (14 + 9)/2 km/hr
Correct Option: C
Man's rate in still water = (14 + 9)/2 km/hr = 11.5 km/hr
- The speed of a boat in still water is 2km/hr. If its speed upstream be 1 km/hr, then speed of the stream is ?
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Let the speed of stream be x km/hr
Then, speed upstream = (2 - x ) km/hrCorrect Option: C
Let the speed of stream be x km/hr
Then, speed upstream = (2 - x ) km/hr
⇒ 2 - x = 1
∴ x = 1 km/hr
