Answer:
45 mph
Step-by-step explanation:
This is a really good question to know the answer to. It is tricky and a bit indirect (which means you have to find something else before you can find the speed of the car.)
Let's keep track of what he does in the time allotted.
How far does Joe go in 5 minutes? That's the amount of time he's on the road before she is.
convert 5 minutes into hours. 5 minutes * 1 hour / 60 minutes = 1/12 of an hour
d = r*t
r = 30 km/hour
t = 1/12 hour
d = 30 km/hr * 1/12 hour = 2.5 km
Now she's about to start. She wants to catch him in 10 minutes
d = r*t
r = x mph
t = 10 minutes = 10 minutes * 1 hour * 60 minutes = 1/6 of an hour.
How far does he go in the 10 minute time?
d = 30 * 1/6 = 5 km
What is his total distance
5 km + 2.5 km = 7.5 km
Finally how fast does she need to go to catch him
d = 7.5 km
r = ? This is what you are trying to find
t = 1/6 of an hour
d = r*t
7.5 km = r * (1/6)hour divide by 1/6 hour
7.5 km // 1/6 hour = r
r = 7.5 * 6 = 45 mph
X + 2 1/2 - 3/4 = 5 1/4 To find x, go backwards in the equation.
5 1/4 + 3/4 = 6 cups
6 - 2 1/2 = 3 1/2 cups
x = 3 1/2 cups
Answer:
C = 12.
Step-by-step explanation:
Given :-
- Radius of circle , r = 2.
- Value of pi, π = 3
To find :-
Formula for finding circumference of circle;
Circumference of circle = 2 × π × radius.
<u>Solution :-</u>
Circumference of circle = 2 × π × radius.
- Substitute the value of radius into the formula.
Circumference of circle = 2 × π × 2
Circumference of circle = 4 π.
Circumference of circle = 4 × 3
Circumference of circle = 12
Answer:
hence the value of y is 19°
Step-by-step explanation:
y+125+36=180(sum of inside the triangle is 180°)
y+161=180
y=180-161
y=19°
Answer:
x=4
Step-by-step explanation:
(x-4)2+8=0
(x-4)10=0
10x-40=0
10x=0+40
10x=40
x=40/10
x=4
