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Luda [366]
3 years ago
15

If a plane can travel 500 miles per hour with the wind and 400 miles per hour against the wind, find the speed of the wind and t

he speed of the plane in still air . what is the speed of the wind?
pleaseeee helpp asap ​
Mathematics
1 answer:
OLga [1]3 years ago
8 0
Wind speed is 50 mph
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The total cost of painting of four walls of a square hall at Rs. 40 per sq. m. is Rs. 12000. If the hall contains 600 m³ of air,
astra-53 [7]

Answer:

The height of the hall is 9.375 meters

Step-by-step explanation:

The rate at which the walls of the square hall are painted, R = Rs. 40 per sq. m.

The total cost of painting the square hall, C = Rs. 12,000

The volume of air contained in the hall, V = 600 m³

The surface area of the four walls of the hall, A = C/A

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Let 's' represent the length of sides of the square hall, and let 'h' represent the height of the square wall, we have;

The volume of the hall, V = s² × h

The surface area of the wall, A = 4 × s × h

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A = 300 = 4 × s × h

V = 600 = s² × h

V/A = 600/300 = 2 = s² × h/(4 × s × h) = s/4

s/4 = 2

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From the area, A = 4 × s × h, we get;

A = 300 = 4 × 8 × h

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The height of the hall, h = 9.375 m.

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3 years ago
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Step-by-step explanation:

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