A boat covers 14 km upstream in 56 minutes (stream speed 2 km/h). Find the boat’s still-water speed.

Difficulty: Medium

6 km/hr
15 km/hr
14 km/hr
17 km/hr
—

Correct Answer: 17 km/hr

Explanation:

Introduction / Context:
Convert minutes to hours, deduce upstream speed, then add the known stream speed to get still-water speed.

Step-by-Step Solution:

Time = 56 min = 56/60 h.Upstream speed u = distance/time = 14 ÷ (56/60) = 14 × 60/56 = 15 km/h.With stream s = 2, still-water b = u + s = 15 + 2 = 17 km/hr.

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