For this case what you can do is an average to calculate the number of hours it will take them to work together:
Let
t: average time.
hi: hours worked for each one.
n: number of teams.
The average will be given by:
t = (h1 + h2) / (n)
Substituting both values:
t = ((15) + (10)) / (2) = 12.5
answer
it would take 12.5 h to pave that same section of highway if both crews worked together
Step-by-step explanation:
y= x+1 -> (y1)
x²-y = 5 => y = x²-5 -> (y2)
(y2) = (y1) =>
x²-5 = x+1
x²-x-6 = 0
(x-3) (x+2)=0
x1=3 or x2 = -2
y1= 3+1 = 4
y2=-2+1 = -1
the intersects are : (3, 4) and (-2, -1)
so, the point A = (-2, -1) => lies below the x-axis.
and the point B = (3, 4)
the point P :
X = -2 + (4/5 × [3-(-2) ])
= -2 + (4/5 ×5)
= -2 +4 = 2
Y = -1 + (4/5 × [4-(-1) ])
= -1 +(4/5 ×5)
= -1 +4 = 3
so, the coordinates P = (2, 3)
angle A = angle B corresponding angles
8x - 8 = 5x + 25
3x = 33
x = 11
angle B
5x + 25
55 + 25
80°