Question

4. In one hour, a boat goes 11 km/hr along the stream and 5 km/hr against the stream. The speed of the boat in still water (in km/hr) is:
A. 3 km/hr
B. 5 km/hr
C. 8 km/hr
D. 9 km/hr​

Answer 1

Answer:

(c) 8km/hr

Step-by-step explanation:

Hope it will help u ❣️

Answer 2

Given

• In one hour, a boat goes 11 km/hr along the stream and 5 km/hr against the stream.

To find

• The speed of the boat in still water (in km/hr)

Solution

Let , the speed of boat in still water be x

and , speed of stream be y

So ,

The speed of boat along the stream = 11 km/h

so , x + y → 11 km/h --- ( 1 )

and 5 km/h against the stream ,

x - y → 5 km/h --- ( 2 )

Solving both the equations ,

→ x + y + x - y = 11 + 5

→ 2x + y - y = 16

→ 2x = 16

→ x = 8

So , the speed of boat in still water is 8 km/h