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The speed of a boat downstream is 15 km/hr and the speed of the stream is 1.5 km/hr. The speed of the boat upstream is?

13.5 km/hr
16.5 km/hr
12 km/hr
8.25 km/hr

Correct Answer: 12 km/hr

Explanation:

Let the speed of boat in still water be x km/hr
Then, x + 1.5 = 15
⇒ x = 13.5
∴ Speed upstream = (13.5 - 1.5) km/hr = 12 km/hr

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