3 years ago

Please help. Is algebra.

Mathematics

2 answers:

Molodets [167]3 years ago

7 0

The correct answer is D.

Artist 52 [7]3 years ago

3 0

Answer: 2m^4 n^2 it’s option D

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UkoKoshka [18]

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Step-by-step explanation:

Let the original speed be 'x'

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According to question, it becomes,

$\dfrac{600}{x-200}-\dfrac{600}{x}=\dfrac{30}{60}\\\\\dfrac{x-(x-200)}{x^2-200x}=\dfrac{1}{2\times 600}\\\\\dfrac{200}{x^2-200x}=\dfrac{1}{1200}\\\\240000=x^2-200x\\\\x^2-200x-240000=0\\\\x=600,-400$

So, The average speed would be 600 km/hr.

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3 years ago

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Answer:

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