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Q. Ritu can row downstream 20km …

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

Posted by Saurav Kumar 8 years, 1 month ago

CBSE > Class 10 > Mathematics

1 answers

Payal Singh 8 years, 1 month ago

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

${20\over x+y} = 2$

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

Also

${4\over x-y} = 2$

=> 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

0Thank You

ANSWER

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