Question

A man can row 2 km upstream in 20 min and can return in another 15 min. His average speed for the entire journey​

Answer 1

The average speed would be $6\dfrac{6}{7}$ km per hour

Step-by-step explanation:

Given,

One sided distance = 2 km,

So, total distance = 2 + 2 = 4 km,

Time taken in upstream = 20 min = $\frac{20}{60}$ = $\frac{1}{3}$ hours,

( ∵ 1 hour = 60 minutes ),

While, time taken in downstream = 15 minutes = $\frac{15}{60}$ = $\frac{1}{4}$ hours,

Thus, total time taken = $\frac{1}{3}+\frac{1}{4}=\frac{4+3}{12}=\frac{7}{12}$ hours,

Now,

$\text{Speed}=\frac{Distance}{Time}$

Hence, average speed = $\frac{4}{\frac{7}{12}}=\frac{48}{7}=6\frac{6}{7}\text{ km per hour}$

#Learn more:

Find average speed :

https://brainly.in/question/9993581

Answer 2

Answer:

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