Question

Ritu can row downstream 20km in 2 hours and upstream 4 km in 2 hours. Find her speed of rowing in still water and the speed of the current.​

Answer 1

Answer:

The speed of rowing in still water is 6 km/h and the speed of the current is 4 km/h.

Step-by-step explanation:

Let her speed of rowing in still water is x and the speed of the current is y

x+y=(20/2)

x-y=(4/2)

Solving the above mentioned equations, we get

x=6 km/h , y=4 km/h.

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Answer 2

Step-by-step explanation:

Let speed of ritu in still water = x km/h

Speed of stream = y km/h

Then downstream speed of ritu = x + y

Upstream speed of ritu = x - y

According to question

20x+y=2

=> x +y = 10 .... (1)

Also

4x−y=2

=> x - y = 2 ..... (2)

Add (1) and (2)

2x = 12

=> x = 6

From (1), we get

6 + y = 10

=> y = 4

speed of ritu in still water = 6km/h

Speed of stream = 4km/h