document.write( "Question 723260: A helicopter leaves the air station going 180 mph. 30 minutes later an airplane leaves going 330 mph. How many minutes until the airplane catches up with the helicopter?\r
\n" ); document.write( "\n" ); document.write( "I set it up as 180x=330(x-30). I don't think it is right though. If you could please help solve this and give the steps too I would be very grateful. Thanks :) \n" ); document.write( "
Algebra.Com's Answer #443085 by Alan3354(69443)\"\" \"About 
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A helicopter leaves the air station going 180 mph. 30 minutes later an airplane leaves going 330 mph. How many minutes until the airplane catches up with the helicopter?\r
\n" ); document.write( "\n" ); document.write( "I set it up as 180x=330(x-30).
\n" ); document.write( "Solve for x, see if it's right.
\n" ); document.write( "180x = 330x - 990
\n" ); document.write( "-150x = -990
\n" ); document.write( "x = 99/15 = 6.6 hours
\n" ); document.write( "Seems like a long time.
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\n" ); document.write( "30 mins = 0.5 hours
\n" ); document.write( "d = r*t = 180*0.5 --> the helicopter is 90 miles away when the plane starts
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\n" ); document.write( "The plane \"gains on\" the h/c at 150 mi/hr (330 - 180)
\n" ); document.write( "t = d/r = 90/150
\n" ); document.write( "t = 0.6 hours
\n" ); document.write( "t = 36 minutes
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