a) 6 km/h
b) 6.5 km/h
c) 4.5 km/h
d) 5 km/h
Answer: d
Explanation: Let the speed of the current be x km/h.
$$\frac{{15 + x}}{{15 – x}} = \frac{2}{1}$$
15 + x = 30 – 2x
3x = 30 – 15
3x = 15
x = 5 km/h
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