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Diano4ka-milaya [45]
3 years ago
7

Hillary leaves Point A traveling due east at a constant speed of 40 miles per hour. After Hillary has driven 22 miles, her broth

er, Arnold, leaves Point A also traveling due east on the same road. At what constant rate of speed, in miles per hour, must Arnold drive in order to catch up to Hillary in 2 hours?
Mathematics
1 answer:
Marrrta [24]3 years ago
5 0
51 miles per hour is the answer :)
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Candice spent 5 1/4 hours doing her homework. Her brother, Ronald, spent 1/2 that number of hours doing his homework. How many h
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Let

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y-----> the number of hours that Ronald spent doing his homework

we know that

x=5\frac{1}{4}\ hours

convert mixed number to an improper fraction

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so

x=\frac{21}{4}\ hours -------> equation A

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Substitute equation A in equation B

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convert an improper fraction to a mixed number

\frac{21}{8}\ hours=2.625=2+0.625=2+\frac{5}{8}=2\frac{5}{8}\ hours

therefore

<u>the answer is the option B</u>

2\frac{5}{8}\ hours

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