The speed of a boat in still water is 25 mph. the jacksons traveled 70 ml down the woodset river in this boat in the same amount of time it took them to return 30 mi up the river. find the rate of the river's current?

Speed of river's current = 10 mph

Step-by-step explanation:

Given:

Speed of boat in still water =25 mph

Distance traveled  by Jacksons down stream= 70 miles

Distance traveled by Jacksons up stream= 30 miles

Let rate of river's current be = mph

Speed of the boat down the river = mph

Speed of the boat up the river = mph

hours  [ represent tie taken by the boat down stream.]

hours [ represent tie taken by the boat up stream.]

We know that

So,

Solving for

Cross multiplication.

Using distribution.

Adding both sides.

Subtracting fro both sides.

Dividing both sides by

∴

Speed of river's current = 10 mph

6,250

step-by-step explanation:

to get the area, multiply 360 by 160.(57,600)

to find out how many bags of fertilizer it will take, first figure out how many square feet one bag can hold. divide 1000 by 8(125) to get the unit rate(how many square feet one pound of fertilizer can hold)and multiply it by 50(6250). if i haven't made a mistake, that is the answer.

the height of the surface increases from the center out to the sides of the road.

step-by-step explanation:

as we move out we move away from the x-axis.

and as mentioned in the problem statement that height of a road increases when we move away from the center x.

hence proved that 3rd option

the height of the surface increases from the center out to the sides of the road.

is the correct option.