document.write( "Question 1187160: A train is going at 1/4 of its usual speed and it take an extra 45 minutes to reach its destination. Find its usual time to cover the same distance. \n" ); document.write( "

Algebra.Com's Answer #818094 by ikleyn(52786) $\"\"$ $\"About$

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\n" ); document.write( "A train is going at 1/4 of its usual speed and it take an extra 45 minutes to reach its destination.
\n" ); document.write( "Find its usual time to cover the same distance.
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document.write( "Let t be the usual time, in minutes.\r\n" );
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document.write( "When the train moves at 1/4 of the usual speed, the travel time is 4 times the usual time, i.e. 4t minutes.\r\n" );
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document.write( "We are given  4t - t = 45 minutes,  which gives  3t = 45 minutes  and  t = 45/3 = 15 minutes.\r\n" );
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document.write( "ANSWER.  Usual time is 15 minutes.\r\n" );
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