document.write( "Question 923716: Plane A flies from airport A to airport B with 800 km/h. Plane B flies from airport B to airport A with 900 km/h. The distance between the 2 airports is 425 km. How long does it take before the 2 airplanes come across each other? \n" ); document.write( "
Algebra.Com's Answer #560262 by TimothyLamb(4379)\"\" \"About 
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s = d/t
\n" ); document.write( "t = d/s
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\n" ); document.write( "closure speed of the two airplanes = 800 + 900 = 1700 kph
\n" ); document.write( "t = 425/1700
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\n" ); document.write( "answer:
\n" ); document.write( "t = 0.25 hours = 15 minutes
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