Asked by jj

two airplanes travelling in opposite directions , leave an airport at the same time. if one plane averages 480 ml/hr and the other averages 520 ml/hr, how long will it take before they are 2000 ml apart?
Answered by Reiny
let the time be t hrs

solve :
480t + 520t = 2000

btw, what is ml/hr ?
wouldn't that be a rate a nurse would use to express the rate at which an infusion would be given?
Answered by Rex
Yes
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