Going down the river went 18km/h. going up the river it only went 4km/h. find the speed of the boat in still water and the speed of the current.

The speed of boat in still water is 11 km/h

The speed of current is 7 km/h  

Step-by-step explanation:

Given as :

The speed in downstream = 18 km/h

The speed in upstream = 4 km/h

Let The speed of boat in still water = x km/h

Let The speed of current = y km/h

Now, According to question

∵ downstream speed = 18

So, x + y = 18 km/h              .........A

∵ upstream speed = 4

So, x - y = 4 km/h                ..........B

Now, Solving equation A and B

(x + y) + (x - y) = 18 + 4

Or, (x + x) + (y - y) = 22

Or, 2 x + 0 = 22

∴   x =

i.e  x = 11 km/h

So, The speed of boat = x = 11 km/h

Now, Put The value of x into eq A

∵   x + y = 18

Or,  11 + y = 18

∴  y = 18 - 11

i.e y = 7 km/h

So, The speed of current = y = 7 km/h

Hence,The speed of boat in still water is 11 km/h and The speed of current is 7 km/h  . Answer

options a,b,c are the right answer.

step-by-step explanation:

a linear parent function is always represented as y = x

if we write this function in the form of y=mx+c

⇒

or  

now if we plot a graph we will find these characteristics:

1) y intercept of the graph is zero so its a straight line passing through origin.

2) as we can see in both the forms of function written, values of x and y may be either positive or negative for the positive slope means points on the graph are either in first quadrant or in third one.

3) it's slope is one.

10/60

step-by-step explanation:

if you divide 10 by 60 the answer is 0.166666 while if you divide or solve the other problems it equals 0.6