document.write( "Question 548742: A cargo ship left Montreal for Halifax at 15km/h. One hour later, a patrol boat left Montreal at 20km/h, trying to overtake the cargo ship. After how long did the patrol boat overtake the cargo ship? \n" ); document.write( "
Algebra.Com's Answer #358441 by mathstutor458(57)\"\" \"About 
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let the time is 't'
\n" ); document.write( "A cargo ship left Montreal for Halifax at 15km/h
\n" ); document.write( "One hour later, a patrol boat left Montreal at 20km/h
\n" ); document.write( "Therefore,distance travelled by the both ships 15(t+1) = 20t
\n" ); document.write( " 15t+15=20t =>5t=15 =>t=3hrs\r
\n" ); document.write( "\n" ); document.write( "overtaking time is 3hrs
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