Question

Choose only one topic and write a story in 200-250 words. Remember to use paragraphs to separate different ideas.

My last vacatio

Answer 1

Explanation:

hope it's helpful for you and please mark as brainlist

Answer 2

Explanation:

Let us assume, the speed of Ritu rowing in still water is xx km/hr.

Also we make the assumption that the speed of current is yy km/hr.

We know that during upstream, the speed of Ritu rowing in still water and speed of the current of the river will be in opposite directions.

Hence the net speed at upstream will be =x−y=x−y km/hr

Similarly, during downstream, the speed of Ritu rowing in still water and speed of the current of the river will be in the same directions.

Hence the net speed at downstream will be =x+y=x+y km/hr

Now we need to use the given data in order to form equations in the assumed variables.

We know that,

Speed = distancetimeSpeed = distancetime

Also, it is given that Ritu can row downstream 20 km in 2 hours.

⇒x+y=202=10⇒x+y=10 ---- (1)⇒x+y=202=10⇒x+y=10 ---- (1)

Similarly, it is given that Ritu can row upstream 4 km in 2 hours.

⇒x−y=42=2⇒x−y=2 ---- (2)⇒x−y=42=2⇒x−y=2 ---- (2)

Now we need to solve equations (1)(1)and (2)(2).

Adding (1)(1) AND (2)(2),we get

x+y+x−y=12⇒2x=12⇒x=6 km/hrx+y+x−y=12⇒2x=12⇒x=6 km/hr

Subtracting (1)(1) AND (2)(2),we get

x+y−x+y=8⇒2y=8⇒y=4 km/hrx+y−x+y=8⇒2y=8⇒y=4 km/hr

Therefore, the speed of Ritu in still water is 6 km/hr and the speed of the current is 4 km/hr.

Hence option (D). Speed of rowing in still water: 6 km/hr and the speed of the current: 4 km/hr is the correct answer.

Note: The relation between speed in still water and speed with current should be kept in mind while solving problems like above. It is important to assume the correct variables and form an equal number of equations to solve them.