document.write( "Question 157259: An ambulance averaged 36 km/h going to an accident and 48 km/h on its return to the hospital. If the total time for the round-trip was 40 mins, including 5 min at the accident scene, how far from the hospital was the accident? \n" ); document.write( "
Algebra.Com's Answer #115947 by checkley77(12844)\"\" \"About 
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d/36+d/48=(40-5)/60
\n" ); document.write( "(4d+3d)/144=35/60
\n" ); document.write( "7d*60=144*35
\n" ); document.write( "420d=5040
\n" ); document.write( "d=5040/420
\n" ); document.write( "d=12 miles for each trip.
\n" ); document.write( "Proof
\n" ); document.write( "12/36+12/48=35/60
\n" ); document.write( "1/3+1/4=7/12
\n" ); document.write( "(4+3)/12=7/12
\n" ); document.write( "7/12=7/12
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