Question

If Nishu can swim downstream at $6km/h$ and upstream at $2km/h$. What is his speed in still water?

Answer 1

Step 1: Given Data

Downstream speed $=6km/h$

Upstream speed $=2km/h$

Let the speed of the mas in still water be $xkm/h$.

Let the speed of the stream be $ykm/h$.

Step 2: Calculate the Required Speed

From the question we have,

$$\begin{gathered} x+y=6\left(1\right) \\ x-y=2\left(2\right) \end{gathered}$$

From equation $\left(1\right)$ and $\left(2\right)$ we get,

$$\begin{gathered} 2x=8 \\ \Rightarrow x=4 \end{gathered}$$

Hence, the speed of Nishu in still water is $4km/h$.