document.write( "Question 499530: two planes, one going north and one going south, depart simultaneously from the same airport. If they travel at 450 km/h and 620 km/h respectively, how many hours will pass before they are 2800 km apart?? \n" ); document.write( "
Algebra.Com's Answer #337754 by mananth(16946)\"\" \"About 
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Car I -------- 450 km/h
\n" ); document.write( "Car II -------- 620 km/h
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\n" ); document.write( "they are traveling away from each other
\n" ); document.write( "so add up speeds
\n" ); document.write( "620 + 450 = 1070 km/h
\n" ); document.write( "Distance = 2800 km
\n" ); document.write( "time = d/r
\n" ); document.write( "time= 2800 / 1070
\n" ); document.write( "Time = 2.62 h
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