Discussion
A man can row a boat three quarters of a kilometre in 11.25 minutes. What is the speed of the boat in still water?
Answer: C
Convert both quantities to the units the answer is wanted in.
\[ 11.25 \text{ min} = \frac{11.25}{60} = 0.1875 \text{ h} \]
\[ \text{speed} = \frac{0.75}{0.1875} = 4 \text{ km/h} \]
Equivalently, three quarters of a kilometre in \( \tfrac{3}{16} \) of an hour means \( \tfrac{3}{4} \times \tfrac{16}{3} = 4 \) km/h. No current is mentioned, so this speed is the still-water speed.
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