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

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Solution

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

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Similar questions

20 k m

2 h o u r s

4 k m

2 h o u r s

20 k m

2

4 k m

2

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

20 k m

2

4 k m

2

(1) A Boat takes 2 hours to go to 40 km down the stream and returns in 4 hours find the speed of the boat in still water and speed of the stream

(2) Ritu can row downstream 20 km in 2 hours and upstream 4 km in 2 hours find her speed of rowing in still water and speed of current

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