Answer:
- Elvira's speed: 3.0 mph
- Aletheia's speed: 2.4 mph
Step-by-step explanation:
Let "e" and "a" represent the speeds of Elvira and Aletheia, respectively. Then the total distance they cover is ...
distance = speed × time
(1/2)e + (2/3)a = 3.1
And the relationship between their speeds is ...
e - a = 0.6
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To solve this system, we can double the first equation and subtract the second to get ...
2(1/2e +2/3a) -(e -a) = 2(3.1) -(0.6)
7/3a = 5.6 . . . . . . . . . . simplify
a = (3/7)(5.6) = 2.4 . . . multiply by 3/7
e = a +0.6 = 3.0 . . . . . Elvira's speed is 0.6 mph more than Aletheia's
Elvira's walking speed is 3.0 miles per hour; Aletheia's is 2.4 miles per hour.
5 feet 11 inches plus 3 feet 5 inches equals 8 feet 16 inches, but there is 12 inches in a foot, and 16 inches - 12 = 4 inches, add the one foot you took away to 8. The answer is 9 feet 4 inches.
Answer:
Step-by-step explanation:
The scale factor = 1 : 20
<u>The area is the product of two dimensions, so the area of the model part to actual part is:</u>
<u>If the actual plane has wing area of 400 ft², then the model will have wing area:</u>
5 times a half is 2.5. You can't buy 2.5 boxes so you have to round it up to 3. You would need three boxes of nails.
Answer:
10
Step-by-step explanation:
32-b=3b-8
32+8=3b+b
40=4b
b=10