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
Answer:
<h2>A. 27</h2>
Step-by-step explanation:
Answer:
-50x
Step-by-step explanation:
−1x ( 1 − ( 7²) )
= ( − 1x ) ( 1 + 49 )
= ( −1x ) ( 1 ) + ( −1x ) ( 49 )
= −x − 49x
= −50x
N = 600, the sample size
Because 102 voters said 'Yes' to the proposition, the sample proportion is
The standard error is
The confidence interval is
From tables, z* = 1.96 at the 95% confidence level.
Therefore the confidence interval is
Answer: (0.14, 0.20)
Answer:
kiran will take 48 minutes 16 x 3
mai will take 36 minuttes 13 x 3
Step-by-step explanation:
