Answer:
The radius is a line going from the center to the side of the the circle
Since the problem is requesting the answer in minutes, we are going to convert the speed of Mr. Peter to miles per minutes; to do that, we are going to multiply his speed by the multiplier
![\frac{60min}{1h}](https://tex.z-dn.net/?f=%20%5Cfrac%7B60min%7D%7B1h%7D%20)
:
![60 \frac{miles}{h} * \frac{1h}{60min} =1 \frac{mile}{min}](https://tex.z-dn.net/?f=60%20%5Cfrac%7Bmiles%7D%7Bh%7D%20%2A%20%5Cfrac%7B1h%7D%7B60min%7D%20%3D1%20%5Cfrac%7Bmile%7D%7Bmin%7D%20)
Now, to find the distance from Boston to Worcester, we are going to use the distance formula:
![d=vt](https://tex.z-dn.net/?f=d%3Dvt)
where
![d](https://tex.z-dn.net/?f=d)
is the distance
![v](https://tex.z-dn.net/?f=v)
is the speed
![t](https://tex.z-dn.net/?f=t)
is the time
We know that the speed of Mr. Peter is
![1 \frac{mile}{min}](https://tex.z-dn.net/?f=1%20%5Cfrac%7Bmile%7D%7Bmin%7D)
and his time is 30 minutes. Lets replace those values in our formula:
![d=1 \frac{mile}{min} *30min](https://tex.z-dn.net/?f=d%3D1%20%5Cfrac%7Bmile%7D%7Bmin%7D%20%2A30min)
![d=30miles](https://tex.z-dn.net/?f=d%3D30miles)
Now, lets concentrate on Mr. Peter clone, Mr. P:
Lets convert the speed of Mr. P to miles per minute:
![\frac{90miles}{h} * \frac{1h}{60min} =1.5 \frac{miles}{min}](https://tex.z-dn.net/?f=%20%5Cfrac%7B90miles%7D%7Bh%7D%20%2A%20%5Cfrac%7B1h%7D%7B60min%7D%20%3D1.5%20%5Cfrac%7Bmiles%7D%7Bmin%7D%20)
We also know that they will cover the same distance, 30 miles. Lets replace the values in our formula one more time to find t:
![d=vt](https://tex.z-dn.net/?f=d%3Dvt)
![30miles= 1.5\frac{miles}{min} *t](https://tex.z-dn.net/?f=30miles%3D%201.5%5Cfrac%7Bmiles%7D%7Bmin%7D%20%2At)
![t= \frac{30miles}{1.5\frac{miles}{min}}](https://tex.z-dn.net/?f=t%3D%20%5Cfrac%7B30miles%7D%7B1.5%5Cfrac%7Bmiles%7D%7Bmin%7D%7D%20)
![t=20min](https://tex.z-dn.net/?f=t%3D20min)
But since Mr. P <span>leaves 5 minutes after Mr. Peters, we need to add those 5 minutes to M. P's time:
</span>
![t=20min+5min](https://tex.z-dn.net/?f=t%3D20min%2B5min)
We can conclude that Mr. P will arrive first, 5 minutes before Mr. Peter.
4/5-2/3= 12/15-10/15 (common denominator is 15)=2/15 pounds of seeds left
Se did not got an A, as you said she needs at least 90% right and she only got 80% right. She had to score at least 18 of the questions correct.
16/20=80/100
16*5=80
18*5=90