document.write( "Question 137427: Two scientists leave a university in seperate vans at the same time. The first scientist travels east at 20 mph and the second scientist travels west at 25 mph. If there radios have a range of 90 miles, how long before they lose radio contact? \n" ); document.write( "
Algebra.Com's Answer #100567 by ptaylor(2198)\"\" \"About 
You can put this solution on YOUR website!
Distance(d) equals Rate(r) times Time(t) or d=rt; r=d/t and t=d/r\r
\n" ); document.write( "\n" ); document.write( "distance first scientist travels=20t
\n" ); document.write( "distance second scientist travels=25t\r
\n" ); document.write( "\n" ); document.write( "Now we know that when the above two distances equal 90 mi, they will have lost contact, so our equation to solve is:\r
\n" ); document.write( "\n" ); document.write( "20t+25t=90
\n" ); document.write( "45t=90 divide both sides by 45
\n" ); document.write( "t=2 hrs--------------amount of time that elapses before they lose contact\r
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\n" ); document.write( "\n" ); document.write( "Hope this helps---ptaylor\r
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