Question

Ritu can row 20 kilometre downstream in 2 hours he can row 4 kilometre upstream in 2 hour find the speed of the speed of stream

Answer 1

Explanation:

Given:-

Ritu downstream is 20 km in 2 hours.

Ritu upstream is 4 km in 2 hours.

To find:

Speed of the stream =?

Solution:

The speed of the rowing on still water

denoted by a kmph.

The speed of the stream denoted by

b kmph.

The upstream speed of Ritu’s rowing is

( a – b ) kmph

The downstream speed of

Ritu’s rowing is ( a + b ) kmph

ATQ,

2( a + b ) = 20

a + b =10______________ (1)  

and

2( a - b ) = 4

a - b = 2_____________ (2)

adding equations (1) + (2)

a + b + a -b = 10 + 2

2a = 12

a = 6

substitute a value in equation (1)

6 + b = 10

b = 10 - 6

b = 4

therefore speed of stream is b = 4 kmph

Answer 2

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