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Ritu can row stream 20 kilometre …

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Ritu can row stream 20 kilometre in 2 hour and upstream 4 kilometre in 2 hour find her speed of rowing still water and speed of current.

Posted by Sweety Verma 5 years, 4 months ago

CBSE > Class 10 > Mathematics

1 answers

Yogita Ingle 5 years, 4 months ago

Let the speed of Ritu in still water and the speed of stream be x km/h and y km/h.

Upstream = (x – y) km/h

Downstream = (x + y) km/h

⇒ 2(x + y) = 20

⇒ x + y = 10 ... (i)

⇒ 2(x – y) = 4

⇒ x – y = 2 ... (ii)

Putting this equation in (i), we get

⇒ y = 4

Ritu’s speed in still water is 6 km/h

The speed of the current is 4 km/h.

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CBSE > Class 10 > Mathematics