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miv72 [106K]
3 years ago
6

The sum of the speeds is 720.8 miles per hour. If the speed of the first train is 9.2 mph faster than that of the second train,

find the speeds of each
Mathematics
2 answers:
Nataly [62]3 years ago
6 0
Let the speed of second train = x mph

Speed of first train = (x+9.2) mph

The sum of the speeds is 720.8 mph

x + (x + 9.2) = 720.8 \\ \\ 2x + 9.2 = 720.8 \\ \\ 2x = 720.8 - 9.2 \\ \\ 2x = 711.6 \\ \\ x = \frac{711.6}{2} \\ \\ \underline{x = 355.8 \: mph}

\underline{x + 9.2 = 355.8 + 9.2 = 365 \: mph}

\textbf{\red{Speed of first train = 365 mph}} \\ \\ \textbf{\red{Speed of second train = 355.8 mph}}
yuradex [85]3 years ago
3 0

Sum and difference problem.

Speed of faster train = (Sum+difference)/2=(720.8+9.2)/2=365 mph

Speed of slower train = (Sum-difference)/2=(720.8-9.2)/2=355.8 mph

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The formula we'll use for this is the simple interest formula, or:

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To find the simple interest, we multiply 30000 × 0.02 × 5 to get that the interest is: $3000.00

Now, if you want to calculate the interest on $30000 at 5% interest per year after 5 years, this is the correct answer:

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hope this helped! will you pls give a "thanks" and/or leave a brainllest since I had to do two different equations? :)

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