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Speed of boat upstream = 3 × speed of current. Speed of boat downstream = 30 km/hr. Find time to travel 63 km upstream.

1. 2.5 hr
2. 3 hr
3. 3.5 hr
4. 4 hr

Correct answer: 3.5 hr

Solution

Upstream speed=3c (still-current=3c, so still=4c). Downstream=still+current=5c=30 → c=6. Upstream=3×6=18 km/h. Time=63/18=3.5 hours.

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