Question

Tina can row downstream 30km in 5 hours and upstream 8km in 2 hours.then speed of stream and speed of Boat in still water are _ and _ in km/hr.please tell fast and this is a 4 marks question...​

Answer 1

Answer:

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.

Answer 2

Step-by-step explanation:

Let the speed of man is u and that of current is v

Downstream speed will be u+v

Upstream speed will be u−v

He travels 30 km downstream in 5 hrs

So, downstream speed is 530=6 km/hr

Similarly upstream speed will be 518=3.6 km/hr

So, u+v=6

⇒u−v=3.6

Subtracting both the equations;

⇒2v=2.4

⇒v=1.2 km/hr

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