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Cerrena [4.2K]
2 years ago
11

Bartolo is running a race. He determines that if he runs at an average speed of 15 feet/second, he can finish the race in 6 seco

nds. If he runs at an average speed of 18 feet/second, he can finish the race in 5 seconds.
Bartolo thinks that the fastest he can run is 30 feet/second. How long would it take him to finish the race at this speed?

A.
2 seconds
B.
2.5 seconds
C.
3 seconds
D.
3.5 seconds
Mathematics
1 answer:
Gelneren [198K]2 years ago
7 0

Answer:

C

Step-by-step explanation:

the distance is 15•6 = 18•5 = 90 feet

so, time needed = 90/30 = 3 second

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A painter is painting a wall with an area of 150 ft2. He decides to paint half of the wall and then take a break. After his brea
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The answer is 141.35 ft²

Before the first break, it was painted:
150 ft² ÷ 2 = 75 ft²
Now it's left:
150 ft² - 75 ft² = 75 <span>ft²

Before the second break, it was painted:
75 </span>ft² ÷ 2 = 37.5 <span>ft²
Now it's left:
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Before the third break, it was painted:
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<span>Before the fourth break, it was painted:
</span>18.75 ft² ÷ 2 = 9.375 <span>ft²
</span><span>Now it's left:
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<span>Before the fourth break, it was painted:
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Now, we will sum what he painted for now:
75 ft² + 37.5 ft² + 18.75 ft² + 9.375 ft² 4.6875 ft² = 141.3125 ft² ≈ 141.35 ft²

When the painter takes his fifth break, there will be <span>141.35 ft² of the wall painted.</span>
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