Question

5. Ritu can row downstream 20 km in 2 hours, and upstream 4 km in 2 hours. Her speed of rowing in still water and the speed of the current is O 6 km/hr and 3 km/h O 7 km/hr and 4 km/h O 6 km/hr and 4 km/h O 10 km/hr and 6 km/h​

Answer 1

Answer:

Step-by-step explanation: Let, speed of Ritu in still water be x km/hr

and speed of current be y km/hr

Then speed downstream =(x+y) km/hr

speed upstream =(x−y) km/hr

we know, Time=  

Speed

Distance

​

 

Then  

x+y

20

​

=2 and  

x−y

4

​

=2

⇒x+y=10 ...(1)

&   x−y=2 ...(2)

adding both we get, 2x=12⇒x=6

Thus using (1) y=10−6=4

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