Question

The speed of current is 4 km/hour. A boat takes 3 hours to go 18 km

downstream and return 6 km up-stream. Find the speed of boat​

Answer 1

answer:

Let the speed of the boat in still water =x km/hr and the speed of the stream y km/hr.

Then, speed downstream =x+y=

4

18

=

2

9

...(i)

and speed upstream =x−y=

12

18

=

2

3

...(ii)

Subtracting eq (ii) from eq (i), we get,

2y=

2

6

=3

⇒ y=1.5 km/hr

hope useful.