Question

. A man can row at a speed of 7.5 kmph in still water
to a certain point upstream and back to the starting
point in a river which flows at 1.5 kmph. Find his
average speed for the entire journey:​

Answer 1

Answer:

Here is your Answer : 3 km

Step-by-step explanation:

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Answer 2

Let the speed be x km.

Given,

• Speed of the man in still water = 7.5 km/h

• Speed of the river = 1.5 km/h

Therefore,

• Speed of the man downstream = 7.5 + 1.5 = 9 km/h

• Speed of the man upstream = 7.5 - 1.5 = 6 km/h

According to the question,

$\frac{x}{9}+\frac{x}{6}=\frac{50}{60}$

$\implies \frac{6x+9x}{54}=\frac{5}{6}$

$\implies 90x=270$

$\implies x= 3$

$\boxed{\bold{\therefore{Averaage\:Speed=3\:km/h}}}$