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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.}
 one year ago
 one year 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.}
 one year ago
 one year ago

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CliffSedgeBest ResponseYou've already chosen the best response.0
Distance = speed × time.
 one year ago

CliffSedgeBest ResponseYou've already chosen the best response.0
There are two distances and two speeds, but the two distances add up to 1000mi. and the time for both is the same.
 one year ago

kaiteDIDBest ResponseYou've already chosen the best response.0
how does 320+280=1000
 one year ago

CliffSedgeBest ResponseYou've already chosen the best response.0
320×time + 280×time = 1000.
 one year ago

CliffSedgeBest ResponseYou've already chosen the best response.0
You have to find the time.
 one year ago

CliffSedgeBest ResponseYou've already chosen the best response.0
"320+280=1000" would be 'speed + speed = distance' which doesn't make sense.
 one year ago

kaiteDIDBest ResponseYou've already chosen the best response.0
so speed + speed = distance means that it equals 600?
 one year ago

CliffSedgeBest ResponseYou've already chosen the best response.0
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.
 one year ago

CliffSedgeBest ResponseYou've already chosen the best response.0
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.
 one year ago

CliffSedgeBest ResponseYou've already chosen the best response.0
dw:1349967841261:dw
 one year ago

CliffSedgeBest ResponseYou've already chosen the best response.0
Go back through everything I wrote a little at a time and think about it. I'm sure you'll figure it out.
 one year ago

kaiteDIDBest ResponseYou've already chosen the best response.0
is the time 4:00 a.m.?
 one year ago
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