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Sphinxa [80]
3 years ago
15

Train a has a speed 15 miles per hour greater than that of train

Mathematics
1 answer:
Sonbull [250]3 years ago
6 0

Train a speed = x+15

Train b speed =x

255/x = 300/(x+15)

255(x+15) = 300x

255x +3825 =300x

3825 = 45x

X = 3825/45 =85

<span>Train B  = 85 miles per hour</span>

<span> Train A = 85+15 = 100 miles per hour</span>


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Brrunno [24]

Answer:

El área del rectángulo es:

27 cm²

Step-by-step explanation:

Consideración:

La formula del perímetro de un rectángulo es:

p = 2(altura + base)

Planteamiento:

24 = 2(a+b)

b = 3a

a = longitud de la altura del rectángulo

b = longitud de la base del rectángulo

Desarrollo:

sustituyendo el valor de la segunda ecuación del planteamiento en la primer ecuación del planteamiento:

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12 = 4a

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de la segunda ecuación del planteamiento:

b = 3a

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Comprobación:

de la primer ecuación del planteamiento:

24 = 2(3+9)

24 = 2*12

Respuesta:

la formula del área de un rectángulo es:

A = base * altura

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LekaFEV [45]

Answer:

.

Step-by-step explanation:

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