Question
Petra and Celine can paddle their canoe at a rate of $10 \mathrm{mph}$ in calm water. How long will it take them to travel 4 mi against the 2-mile-per-hour current of the river?
Step 1
They can paddle their canoe at a speed of $10 \mathrm{mph}$ in calm water. However, the river has a current of $2 \mathrm{mph}$ against them. Therefore, their effective speed is $10 \mathrm{mph} - 2 \mathrm{mph} = 8 \mathrm{mph}$. Show more…
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