document.write( "Question 681525: two cars started a journey from A to B 150 km apart on the same road towards each other. The car from A travelled at a constant speed of 10knn/h more then that of the other car that also travelled at a constant speed. the two cars crossed each other after 72 mins. what was the speed of the car that started from b. \n" ); document.write( "
Algebra.Com's Answer #422695 by ankor@dixie-net.com(22740)\"\" \"About 
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two cars started a journey from A to B 150 km apart on the same road towards each other.
\n" ); document.write( " The car from A traveled at a constant speed of 10knn/h more then that of the other car that also traveled at a constant speed.
\n" ); document.write( " the two cars crossed each other after 72 mins.
\n" ); document.write( " what was the speed of the car that started from b.
\n" ); document.write( ":\r
\n" ); document.write( "\n" ); document.write( "Let s = Car from A speed
\n" ); document.write( "then
\n" ); document.write( "(s-10) = Car from B speed
\n" ); document.write( ":
\n" ); document.write( "Change 72 min to 1.2 hrs
\n" ); document.write( ":
\n" ); document.write( "Write a distance equation; dist = time * speed
\n" ); document.write( "Car A dist + Car B dist = 150 km
\n" ); document.write( "1.2s + 1.2(s-10) = 150
\n" ); document.write( "1.2s + 1.2s - 12 = 150
\n" ); document.write( "2.4s = 150 + 12
\n" ); document.write( "s = 162/2.4
\n" ); document.write( "s = 67.5 km/hr car A
\n" ); document.write( "then
\n" ); document.write( "57.5 km/hr car B
\n" ); document.write( ":
\n" ); document.write( ":
\n" ); document.write( "See if that checks out, find the dist each traveled
\n" ); document.write( "1.2(67.5) = 81 km
\n" ); document.write( "1.2(57.5) = 69 km
\n" ); document.write( "--------------------
\n" ); document.write( "total dist: 150 km \n" ); document.write( "
\n" );