CMA Foundation · Fundamentals of Business Mathematics and Statistics · Time and Distance
A boat can travel at 12 km/h in still water. The stream flows at 3 km/h. How long will the boat take to travel 45 km downstream?
The boat takes 3 hours. Downstream speed is the sum of the boat's still-water speed and the stream speed, 12 + 3 = 15 km/h, so 45 km is covered in 45 divided by 15, which equals 3 hours.
- A3 hoursCorrect
- B3.75 hours
- C5 hours
- D4 hours
Explanation
Downstream speed = 12 + 3 = 15 km/h. Time = 45 / 15 = 3 hours. The option 5 hours uses the upstream speed of 9 km/h (45/9), which is wrong because the boat is going with the stream.
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