document.write( "Question 800505: Please help me solve this percentage question: To arrive on time a bus needs 18 hours to complete a normal trip. If the bus must arrive in 10 hours, by what percent must the speed of the bus be increased ? Kindly show the steps. \n" ); document.write( "
Algebra.Com's Answer #483251 by ankor@dixie-net.com(22740)\"\" \"About 
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To arrive on time a bus needs 18 hours to complete a normal trip.
\n" ); document.write( " If the bus must arrive in 10 hours, by what percent must the speed of the bus be increased ?
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\n" ); document.write( "Let s = the normal speed of the bus
\n" ); document.write( "let x = per cent increase in decimal form (for example 1.20 is a 20% increase)
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\n" ); document.write( "distance = 18s (time*speed)
\n" ); document.write( "the same distance can be written
\n" ); document.write( "dist = 10xs
\n" ); document.write( "therefore
\n" ); document.write( "10xs = 18s
\n" ); document.write( "divide both sides by 10s
\n" ); document.write( "x = 1.8, the normal speed has to multiplied by 1.8
\n" ); document.write( "That's a 80% increase in speed to make the trip in 10 hrs
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\n" ); document.write( ":
\n" ); document.write( "You can confirm this say, normal speed is 50 mph
\n" ); document.write( "then dist:
\n" ); document.write( " 18*50 = 900 mi
\n" ); document.write( "increase the speed by 80%: 1.8 * 50 = 90 mph
\n" ); document.write( " 10*90 = 900 mi \n" ); document.write( "
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