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Llana [10]
3 years ago
6

Thomas has constant speeds for both running and walking. When a down-escalator is moving, Thomas can run down it in

Mathematics
1 answer:
irakobra [83]3 years ago
3 0

Answer:

40 seconds

Step-by-step explanation:

Ratio of 15:30 = 1:2

             20:x

x = 20 x 2 using ratio, also stop putting these Maths challenge qs on website.

x = 40 :)

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Ivenika [448]
F(X) = 6/X

F(X) = 6 • 1/X

F(X) = 6 • x^-1

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F'(X) = 6 • d(x^-1)/dx

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F'(X) = 6 • -1x^-2

F'(X) = -6x^-2

F'(X) = -6/x^2
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