A Coast Guard patrol boat travels at 15 km/h in still water. If the river current flows at 3 km/h, what distance can the boat travel upstream in 4 hours?
Answer and explanation
Correct answer: D. 48 km
- Step 1: Upstream speed = Boat speed - Current speed = 15 - 3 = 12 km/h. Step 2. Distance = Speed Time = 12 4 = 48 km. Answer: 48 km, multiplying the net upstream speed of 12 km/h (15 - 3) by 4 hours. Why not the others: 72 km is downstream distance (18 4); 60 km is still-water distance (15 4).
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