Question

A boat while travelling upstream covers a distance of 18 km at the speed of 3 km/h, whereas while travelling downstream it covers the same distance at a speed of 9 km/h. What is the speed of the boat in still water?

Answer 1

Answer:

6kmph

Step-by-step explanation:

Bs+ws=9

Bs-ws=3

Then Bs =6kmph

Answer 2

Answer:

The speed of the boat is 6 km/hr.

Step-by-step explanation:

Given, speed during upstream & downstream are 3 km/hr & 9 km/hr.

To find the speed of the boat in still water.

Let the speed of the boat be x km/hr.

The speed of the stream be y km/hr.

Speed during upstream=x-y

speed during downstream=x+y

According to the question:

x-y=3     ....(1)

x+y=9    ..(2)

Add equation (1) & (2) we get:

2x=12

 x=6 km/hr

So, the speed of the boat is 6 km/hr.

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