document.write( "Question 618974: if a car travels from a to b at 75mph and from b to a at 50mph what is the avrage speed of the car \n" ); document.write( "
Algebra.Com's Answer #389217 by nerdybill(7384)\"\" \"About 
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if a car travels from a to b at 75mph and from b to a at 50mph what is the avrage speed of the car
\n" ); document.write( "d = distance from a-b or b-a
\n" ); document.write( "d/75 = time from a-b
\n" ); document.write( "d/50 = time from b-a
\n" ); document.write( ".
\n" ); document.write( "total distance traveled: 2d
\n" ); document.write( "total time: d/75 + d/50
\n" ); document.write( ".
\n" ); document.write( "distance formula:
\n" ); document.write( "d = rt
\n" ); document.write( "r = d/t
\n" ); document.write( ".
\n" ); document.write( "average speed:
\n" ); document.write( "notice the 'd' cancels out:
\n" ); document.write( "2d/(d/75 + d/50)
\n" ); document.write( "2d/d(1/75 + 1/50)
\n" ); document.write( "2/(1/75 + 1/50)
\n" ); document.write( "multiplying by 300/300:
\n" ); document.write( "600/(4 + 6)
\n" ); document.write( "600/(10)
\n" ); document.write( "60 mph
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