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kaiteDID

  • 2 years ago

At 10:00 a.m. two planes leave an airport. If the northbound plane flies at 280 mph and the southbound at 320 mph, at what time will they be 1,000 miles apart? { a.m.}

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  1. CliffSedge
    • 2 years ago
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    Distance = speed × time.

  2. CliffSedge
    • 2 years ago
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    There are two distances and two speeds, but the two distances add up to 1000mi. and the time for both is the same.

  3. kaiteDID
    • 2 years ago
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    how does 320+280=1000

  4. CliffSedge
    • 2 years ago
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    320×time + 280×time = 1000.

  5. CliffSedge
    • 2 years ago
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    You have to find the time.

  6. CliffSedge
    • 2 years ago
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    "320+280=1000" would be 'speed + speed = distance' which doesn't make sense.

  7. kaiteDID
    • 2 years ago
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    so speed + speed = distance means that it equals 600?

  8. CliffSedge
    • 2 years ago
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    Speed + speed = distance is nonsensical and cannot be used. There are two distances that add up to 1000, so you need distance1 + distance2 = total distance. distance1=speed1×time, distance2=speed2×time. The only unknown here is the amount of time.

  9. kaiteDID
    • 2 years ago
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    so confusing

  10. CliffSedge
    • 2 years ago
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    It does reduce to an equation that looks like a single speed of 600mph, and a single time of ? for a single total distance of 1000mi.

  11. CliffSedge
    • 2 years ago
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    |dw:1349967841261:dw|

  12. kaiteDID
    • 2 years ago
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    okay

  13. CliffSedge
    • 2 years ago
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    Go back through everything I wrote a little at a time and think about it. I'm sure you'll figure it out.

  14. kaiteDID
    • 2 years ago
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    is the time 4:00 a.m.?

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