Question

ritu can row downstairs 20 km in 2 hrs,and upstream 4km in 2hrs. find her speed of rowing in still water and the speed of the current ?​

Answer 1

Answer:

a group of words containing a subject and a verb, that expresses a statement, a question, etc. When a sentence is written it begins with a big (capital) letter and ends with a full stop

Step-by-step explanation:

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Answer 2

Answer:

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/(x+y) = 2

and 4/(x-y) = 2

⇒x+y=10 ...(1)

and x−y=2 ...(2)

Adding both we get,

2x = 12

⇒x = 6

Thus using (1), we get

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