Question

5. A boat goes 36km downstream in 4 hours and 30km upstream in 5 hours. Find
(i) The speed of boat in still water.
(ii) Speed of the current.
with step​

Answer 1

Answer:

the speed of boat in still water

Answer 2

Step-by-step explanation:

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Let speed of boat in still water be a km/hr.

Let rate of the current be b km/hr.

∴ Speed of the boat upstream =(a−b) km/hr.

∴a−b24+a+b28=6          ...(i)

and a−b30+a+b21=213          ..(ii)

From (i) and (ii), we have

a−b1=61 and a+b1=141

⇒a−b=6 and a+b=14

⇒a=10 km/hr.