document.write( "Question 347693: Hillary is driving North on Route 15 with her cruise control set on 55 mph. Her car is 15 feet long. If it takes 0.2 seconds to pass the same type of car in the opposite direction, how fast is the other car traveling?\r
\n" ); document.write( "\n" ); document.write( "(r1+r2)t=d
\n" ); document.write( "

Algebra.Com's Answer #248611 by josmiceli(19441)\"\" \"About 
You can put this solution on YOUR website!
Let \"s\" = the speed of the other car.
\n" ); document.write( "Since they travel in opposite directions,
\n" ); document.write( "I can consider Hillary's car to be stationary
\n" ); document.write( "and the other car to be traveling at the sum
\n" ); document.write( "of their speeds, which is \"55+%2B+s\"
\n" ); document.write( "First the nose of the other car has to travel 15 ft
\n" ); document.write( "to get side-by-side, and another 15 ft to get
\n" ); document.write( "past Hillary's car.
\n" ); document.write( "\"30%2A%281%2F5280%29+=+%2855+%2B+s%29%2A.2%2A%281%2F3600%29\" (there are 3600 sec /hour and 5280 ft/mile)
\n" ); document.write( "\".00568+=+%2855+%2B+s%29%2A.00005\"
\n" ); document.write( "\".00568+=+.00355+%2B+.00005s\"
\n" ); document.write( "\".00005s+=+.00213\"
\n" ); document.write( "\"s+=+42.6\"
\n" ); document.write( "The other car's speed is 42.6 mi/hr
\n" ); document.write( "
\n" );