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A boat can travel 40 mph in still water. If it t
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”. We’ll call this equation (i) for reference purposes. </p> <p>Speed of boat alone = 40 mph </p> <p>Let speed of current= c </p> <p>Let time= t </p> <p>When boat travels with the current, the speed of the current pushes boat along therefore, </p> <p>Total speed of boat= speed of boat alone + spXXX XX XXXXXXX= ( 40+c ) </p> <p>Putting this speed in equation (i), </p> <p>(XX+c) × t = XXX </p> <p>XXXXXXXXXXX out XXX brackets </p> <p>40t + XX= XXX (XX’ll XXXX XXXX XXXXXXXX XX) </p> <p>XXXX XXXX travels against the current, the XXXXX XX XXX current XXXXX XXXX XXXX XXXXXXXXX, </p> <p>XXXXX XXXXX XX XXXX= speed of boat XXXXX<XXX width="XX" height="19" XXX="XXXX:///C:/Users/ARESE/AppData/Local/XXXX/msohtmlclip1/XX/XXXXXXXXXXXXX.XXX" v:XXXXXX="_x0000_i1025">speed XX XXXXXXX= (XX<img width="XX" height="19" XXX="file:///C:/XXXXX/XXXXX/XXXXXXX/XXXXX/Temp/XXXXXXXXXXXX/01/XXXXXXXXXXXXX.png" v:XXXXXX="_x0000_i1025">c) </p> <p>Again, putting this speed in equation (i), </p> <p>(XX<XXX width="XX" height="19" src="XXXX:///X:/XXXXX/XXXXX/AppData/XXXXX/Temp/XXXXXXXXXXXX/XX/XXXXXXXXXXXXX.png" v:shapes="XXXXXXXXXXXX">c ) × t = 126 </p> <p>XXXXXXXXXXX out the XXXXXXXX </p> <p>40t<XXX width="67" XXXXXX="19" XXX="file:///C:/XXXXX/XXXXX/XXXXXXX/Local/XXXX/XXXXXXXXXXXX/XX/XXXXXXXXXXXXX.XXX" v:shapes="_x0000_i1025">(we’ll call XXXX XXXXXXXX XXX) </p> <p>XXXXXXXXX equations XX XXX iii </p> <p>40t + XX= XXX </p> <p>XXX<img width="67" height="XX" src="XXXX:///C:/XXXXX/XXXXX/AppData/Local/Temp/msohtmlclip1/01/XXXXXXXXXXXXX.png" v:XXXXXX="XXXXXXXXXXXX"> </p> <p>XXXXXXX XXXXX as simultaneous XXXXXXXXX, XX can get XXX XX XXX term ‘ct’ by adding both equations ii and XXX. This XXXXX: </p> <p> 40t + ct= 126 </p> <p>+ 40t<img width="XX" XXXXXX="19" src="file:///X:/Users/XXXXX/XXXXXXX/XXXXX/Temp/msohtmlclip1/01/XXXXXXXXXXXXX.XXX" v:shapes="_x0000_i1025"> </p> <p><img width="XXX" height="X" XXX="XXXX:///X:/XXXXX/ARESE/AppData/Local/XXXX/XXXXXXXXXXXX/XX/clip_image007.XXX" v:shapes="XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"> <XX> </p> <p> 80t = XXX </p> <p>t= <XXX width="XX" XXXXXX="26" XXX="XXXX:///X:/Users/XXXXX/AppData/XXXXX/Temp/XXXXXXXXXXXX/01/XXXXXXXXXXXXX.png" v:shapes="_x0000_i1025"> </p> <p>t=3 XXXXX </p> <p>XXXXXXXXXX or put ‘t=3 XXXXX’ in XXXXXXXX ii </p> <p>(40+c)<XXX width="65" XXXXXX="19" XXX="file:///X:/XXXXX/ARESE/AppData/Local/Temp/msohtmlclip1/XX/XXXXXXXXXXXXX.XXX" v:shapes="XXXXXXXXXXXX"> </p> <p>XXX+ 3c= 126 </p> <p>3c= 126-120 </p> <p>XX= 6 </p> <p>C=<img width="X" XXXXXX="26" XXX="XXXX:///C:/Users/XXXXX/XXXXXXX/XXXXX/Temp/msohtmlclip1/01/clip_image013.XXX" v:shapes="XXXXXXXXXXXX"> </p> <p>X=X mph </p> <p><XXX width="56" XXXXXX="2" XXX="XXXX:///C:/XXXXX/ARESE/XXXXXXX/Local/Temp/msohtmlclip1/XX/XXXXXXXXXXXXX.XXX" v:XXXXXX="XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"><XXX width="56" XXXXXX="X" XXX="XXXX:///X:/XXXXX/XXXXX/AppData/Local/Temp/XXXXXXXXXXXX/01/clip_image014.png" v:XXXXXX="XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX">XXXXX XX XXXXXXX= 2mph </p> <p> </p>">
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