a) 40 km/h
b) 8 km/h
c) 16 km/h
d) 24 km/h
Answer: c
Explanation:
$$\eqalign{
& {\text{Speed of the boat in downstream }} \cr
& {\text{ = }}\frac{{55}}{{2.5}} = \frac{{55 \times 10}}{{25}} = 22\,km/hr \cr
& {\text{Then, speed of the boat in upstream}} \cr
& {\text{ = }}\frac{{22}}{{2.2}} = \frac{{22 \times 10}}{{22}} = 10\,km/hr \cr
& {\text{Speed of the boat in still water}} \cr
& {\text{ = }}\frac{{22 + 10}}{2} = 16\,km/hr \cr} $$
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