Answer:
3.08 km/h.
Step-by-step explanation:
We know that,
Ali traveled at a speed of s km/h for 2.5 hours.
Let d be the distance and t be the time.
...(1)
On his return journey, he increased his speed by 4 km/h and saved 15 minutes. So, distance is d and times is t-15.
...(2)
From (1) and (2), we get
Put t=40 in (1).
So, t=40 and d=100.
Now,
Total distance = d + d = 100 + 100 = 200
Total time = t + t - 15 = 40 + 40 - 15 = 65
So, the average speed is
Therefore, the average speed is 3.08 km/h.
Answer:
Two times the sum of a number and nine.
Step-by-step explanation:
Answer:
(2.5,10.5)
Step-by-step explanation:
In the abscissa (x), A is in the middle point between 0 and 5:
![x=\frac{0+5}{2}\\ x=\frac{5}{2}\\ x=2.5](https://tex.z-dn.net/?f=x%3D%5Cfrac%7B0%2B5%7D%7B2%7D%5C%5C%20x%3D%5Cfrac%7B5%7D%7B2%7D%5C%5C%20x%3D2.5)
In the ordinate (y), A is in the middle point between 9 and 12:
![y=\frac{9+12}{2}\\ y=\frac{21}{2}\\ y=10.5](https://tex.z-dn.net/?f=y%3D%5Cfrac%7B9%2B12%7D%7B2%7D%5C%5C%20y%3D%5Cfrac%7B21%7D%7B2%7D%5C%5C%20y%3D10.5)
Then, the coordinates of point A are:
A=(x,y)→A=(2.5,10.5)
Answer:
6
Step-by-step explanation:
let the number be equal to x
The sum of twice a number= 2x
- 2x+8=20
- 2x=20-8
- 2x=12
- 2x/2=12/2
- x=6
i believe the answer is a