document.write( "Question 312375: An airplane flies 80 km in 10 minutes and the flies 100 km in 20 minutes. The average speed of the airplane is? \n" ); document.write( "
Algebra.Com's Answer #223374 by Fombitz(32388)\"\" \"About 
You can put this solution on YOUR website!
It flew a total of 180 km in 30 minutes(or 1/2 hr).
\n" ); document.write( "\"Vave=180%2F%281%2F2%29=360\"kph
\n" ); document.write( "
\n" ); document.write( "
\n" );