Question

7. Ritu can row 20 km downstream and 4 km upstream in 4 hours. She rows 10 km downstream
and returns in 6 hours. Find her speed of rowing in still water and the speed of the stream.​

Answer 1

Answer:

Speed of rowing in still water: 6 km/hr and the speed of the current: 4 km/hr.

Step-by-step explanation:

Let, speed of Ritu in still water be x km/hr

and speed of current be y km/hr

Then speed downstream =(x+y) km/hr

speed upstream =(x−y) km/hr

we know, Time=Distance

Speed

Then 20 =2 and 4 =2

x+y x-y

⇒x+y=10 ...(1)

& x−y=2 ...(2)

adding both we get, 2x=12⇒x=6

Thus using (1) y=10−6=4

Hence the speed of Ritu in still water is 6 km/hr and the speed of the current is 4 km/hr.

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