document.write( "Question 814264: Mr Ho drove a speed of 60km/h during the first 5/12 of his journey to his office. He completed the rest of his journey in 10 minutes at a speed of 84km/h.How much time did he spend on the entire journey? \n" ); document.write( "

Algebra.Com's Answer #490227 by TimothyLamb(4379) $\"\"$ $\"About$

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D = ?
\n" ); document.write( "s = d / t
\n" ); document.write( "d = s * t
\n" ); document.write( "---
\n" ); document.write( "2nd half:
\n" ); document.write( "d = s * t
\n" ); document.write( "d = 84 km/h * 10 min * (1/60) h/min = 14 km
\n" ); document.write( "D(1 - 5/12) = 14
\n" ); document.write( "D(12/12 - 5/12) = 14
\n" ); document.write( "D(7/12) = 14
\n" ); document.write( "D = 14(12/7)
\n" ); document.write( "D = 24
\n" ); document.write( "---
\n" ); document.write( "1st half:
\n" ); document.write( "d = D - 14 = 24 - 14 = 10 km
\n" ); document.write( "t = d / s
\n" ); document.write( "t = 10/60 hours
\n" ); document.write( "t = 10/60 hours * 60 min/hr = 10 min
\n" ); document.write( "---
\n" ); document.write( "Answer:
\n" ); document.write( "total time = 10 + 10 = 20 min
\n" ); document.write( "---
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