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Answer:

6

Step-by-step explanation:

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Given,

Distance covered upstream = 63 km

Time is taken in upstream = 7 hours

Distance covered downstream = 132 km

Time is taken in downstream = 12 hours

To find,

We have to find the rate of flow of the river.

Solution,

The rate of flow of the river is 9 km/hr in upstream and 11 km/hr in downstream.

Let the speed of a boy in still water be x km/hr

Speed of the current water = y km/hr

Speed in upstream = (x-y) km/hr

Speed in downstream = (x+y) km/hr

Now, Time = Distance/ Speed

In upstream,

                         7= 63/(x-y)    

                        x-y = 9         (1)

In downstream,

                        12 = 132/(x+y)

                       x + y = 11       (2)

Adding equation(1) and (2), we get,

                         2x = 20

                          x = 10

Substituting the value of x in equation (1), we get,

                        y = 11-10

                       y = 1

So, the speed of a boy in still water is 10 km/hr and, the speed of the current water is 1 km/hr.

Hence, the rate of flow of the river is 9 km/hr upstream and 11 km/hr downstream.

Answer:

Step-by-step explanation:

Approximately at what price should he sell the article to make 25 per cent profit? Explanation: 25% of CP should be added to the CP to get a profit of 25%. 25% of 319.60 = 319.60/4 = 79.9.

Answer:

fan friction

Explanation:

The full form of ff is fan friction

Answer:

yes fish is important in bengali cuisine

doi mach is not important in bengali cuisine

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