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A boat’s still-water speed is 2 km/h. If its upstream speed is 1 km/h, find the stream speed.

Difficulty: Easy

1.5 km/hr
3 km/hr
1 km/hr
None of these
—

Correct Answer: 1 km/hr

Explanation:

Solution:
Upstream = b − s = 1 with b = 2 ⇒ s = 1 km/hr.

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