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3 years ago

A submarine cruises underwater at 20 km/h and on

Mathematics

1 answer:

Darina [25.2K]3 years ago

4 0

Answer:

System of equations:

20x + 30y = 650

x + y = 25

Time underwater = 10 hours

Time at the surface = 15 hours

Step-by-step explanation:

Let x = time underwater at 20 km/h.

Let y = time on the surface at 30 km/h.

speed = distance/time

distance = speed * time

distance underwater: 20x

distance on the surface: 30y

total distance: 650

20x + 30y = 650

total time: x + y

total time: 25

x + y = 25

20x + 30y = 650

x + y = 25

20x + 30y = 650

-20x - 20y = -500

--------------------------------

10y = 150

y = 15

x + y = 25

x + 15 = 25

x = 10

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<u>Answer:</u>

The total number of hours Jamie volunteered at a nursing home is 15 hours

<u>Solution:</u>

Jamie volunteered at a nursing home for 6 days.

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We can rewrite $2\frac{1}{2}$ in decimal form to simplify the calculation.

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Therefore, Jamie volunteered 2.5 hours at the nursing home each day.

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3 years ago

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asambeis [7]

Answer:

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Step-by-step explanation:

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damaskus [11]

Answer:

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3 years ago