Question

Angelo's kayak travels 10km/h in still water. If the river's current flows at a rate of 4km/h, How long will it take to travel 35km downstream? it'll take [____] hours.

Answer 1

Given that Angelo's kayak travels 10km/h in still water, and the river's current flows at a rate of 4km/h.

Travelling downstream means Angelo is travelling with the current, that is the current of the water will add to Angelo's speed.

Their combined speed will be;

`\begin{gathered} v=10\text{ km/h + 4 km/h} \\ v=\text{ 14 km/h} \end{gathered}`

To travel 35 km downstream;

`\text{distance = 35km}`

Recall that;

`\begin{gathered} \text{speed = }\frac{\text{ distance}}{\text{time}} \\ \text{time = }\frac{\text{ distance}}{\text{ speed}} \end{gathered}`

substituting the given values;

Therefore, it'll take 2.5 hours