document.write( "Question 1163873: Mr Wong drove from his home to Mr Lee’s house in happy down at an average speed of 80 km/h. His speed for the last 1/4 of the journey was 7/8 of his average speed for the whole journey. If he took 2 1/2 hours for the last 1/4 of the journey how long did it take to travel from his home to Mr Lee’s house? \n" ); document.write( "
Algebra.Com's Answer #788144 by MathTherapy(10552)\"\" \"About 
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\n" ); document.write( "Mr Wong drove from his home to Mr Lee’s house in happy down at an average speed of 80 km/h. His speed for the last 1/4 of the journey was 7/8 of his average speed for the whole journey. If he took 2 1/2 hours for the last 1/4 of the journey how long did it take to travel from his home to Mr Lee’s house?
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Time taken to travel the last ¼ of journey: 2½ hours
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document.write( "Speed during last ¼ of journey: \"matrix%281%2C4%2C+%287%2F8%2980%2C+%22=%22%2C+70%2C+%22km%2Fh%22%29\"
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document.write( "Therefore, ¼ of journey = 2½ * 70 = 175 km
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document.write( "If ¼ of journey is 175 km, then entire journey = 4(175) = 700 km\r
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document.write( "Let time taken to travel the entire journey, be T
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document.write( "Since , we get: \"matrix%281%2C3%2C+80%2C+%22=%22%2C+700%2FT%29\"
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document.write( "80T = 700 ----- Cross-multiplying
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document.write( "Time taken to travel the entire journey, or  \n" );
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