document.write( "Question 764178: A boat completed one quarter of it's journey at 9 30 and two thirds at 10 50. Assuming a constant speed what time did it start and finish? \n" ); document.write( "
Algebra.Com's Answer #465318 by ankor@dixie-net.com(22740)\"\" \"About 
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A boat completed one quarter of it's journey at 9:30 and two thirds
\n" ); document.write( " at 10:50.
\n" ); document.write( "Assuming a constant speed what time did it start and finish?
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\n" ); document.write( "Let the total journey = 1
\n" ); document.write( "Find the portion of the journey covered between 9:30 and 10;50
\n" ); document.write( "\"2%2F3\" - \"1%2F4\" = \"8%2F12\" - \"3%2F12\" = \"5%2F12\" of the journey
\n" ); document.write( "Find the no. of minutes between 9:30 and 10:50 = 80 minutes
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\n" ); document.write( "Distance varies directly with time, use a ratio equation
\n" ); document.write( "Let t = total time for the journey
\n" ); document.write( "\"%285%2F12%29%2F1\" = \"80%2Ft\"
\n" ); document.write( "Cross multiply
\n" ); document.write( "\"5%2F12\"t = 80 * 1
\n" ); document.write( "t = 80*\"12%2F5\"
\n" ); document.write( "t = 192 minutes for the whole journey
\n" ); document.write( ":
\n" ); document.write( "Start time to 9:30; \"1%2F4\" * 192 = 48 minutes
\n" ); document.write( "Start time = 9:30 - 48 min = 8:42 is the start time
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\n" ); document.write( "Find the completion time
\n" ); document.write( "8:42 + 192 min = 8:42 + 3:12 = 11:54 is the completion time
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