Question

a man rows 30 km downstream in 7 hours 30 minutes and 10 km upstream in hours find the speed of the boat in still water and also the speed of stream iska answer bataiye​

Answer 1

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

5

30

=6 km/hr

Similarly upstream speed will be

5

18

=3.6 km/hr

So, u+v=6

⇒u−v=3.6

Subtracting both the equations;

⇒2v=2.4

⇒v=1.2 km/hr

Answer 2

Answer:

4 hours 10 minutes

Step-by-step explanation:

7-3 = 4 then 4 hours 30 km 30 min 10 km 10min then answer is 4 hours and 10 min