Question

A boat covers 32 Km upstream and 36 Km downstream in 7 hours.
Also, it covers 40 Km upstream and 48 Km downstream in 9 hours.
The speed of the boat in still water is :​

Answer 1

Answer:

10 kmph

Step-by-step explanation:

Let the speed of boat in still water be x kmph and speed of stream be y kmph.

In upstream, the relative speed of boat becomes :-

$x - y$

In Downstream, the speed of boat becomes :-

$x + y$

$\rule{200}{2}$

Also,

We know that

Distance = speed X time

Thus,

Time = Distance /speed

$\rule{200}{2}$

Total time = Time taken during downstream +Time taken during upstream.

$\rule{200}{2}$

Refer to the attachment for the used process and detailed Explanation!

Answer 2

LINEAR EQUATIONS IN TWO VARIABLES.

Answer:

Speed of the boat in still water = 10 km/hr

Explanation :

Refer the attached picture.