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Boat’s downstream speed is 15 km/h; stream speed is 1.5 km/h. Find the upstream speed.

Difficulty: Easy

13.5 km/hr
16.5 km/hr
12 km/hr
8.25 km/hr
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Correct Answer: 12 km/hr

Explanation:

Solution:
b = d − s = 15 − 1.5 = 13.5; upstream = b − s = 13.5 − 1.5 = 12 km/hr.

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