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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 of current= ( XX+c ) </p> <p>Putting this speed in equation (i), </p> <p>(XX+c) × t = XXX </p> <p>Multiplying out the XXXXXXXX </p> <p>40t + XX= XXX (XX’ll XXXX XXXX equation ii) </p> <p>When boat XXXXXXX XXXXXXX the current, XXX speed XX XXX current pulls XXXX XXXX XXXXXXXXX, </p> <p>XXXXX speed XX XXXX= XXXXX XX boat XXXXX<img width="XX" XXXXXX="XX" XXX="XXXX:///C:/Users/XXXXX/AppData/Local/XXXX/msohtmlclip1/01/XXXXXXXXXXXXX.png" v:XXXXXX="_x0000_i1025">XXXXX of XXXXXXX= (XX<XXX width="XX" XXXXXX="XX" XXX="XXXX:///C:/Users/XXXXX/AppData/XXXXX/XXXX/msohtmlclip1/XX/clip_image004.XXX" v:shapes="_x0000_i1025">c) </p> <p>XXXXX, putting this speed in XXXXXXXX (i), </p> <p>(40<img width="XX" XXXXXX="XX" src="file:///C:/Users/ARESE/XXXXXXX/Local/XXXX/msohtmlclip1/XX/clip_image004.XXX" v:XXXXXX="_x0000_i1025">c ) × t = XXX </p> <p>Multiplying out the brackets </p> <p>40t<XXX width="XX" height="19" src="XXXX:///C:/XXXXX/ARESE/XXXXXXX/XXXXX/XXXX/XXXXXXXXXXXX/01/XXXXXXXXXXXXX.XXX" v:XXXXXX="_x0000_i1025">(we’ll XXXX this equation XXX) </p> <p>Comparing XXXXXXXXX XX XXX iii </p> <p>40t + ct= 126 </p> <p>40t<img width="XX" height="XX" XXX="XXXX:///X:/XXXXX/XXXXX/XXXXXXX/Local/Temp/XXXXXXXXXXXX/01/XXXXXXXXXXXXX.XXX" v:shapes="XXXXXXXXXXXX"> </p> <p>XXXXXXX these XX XXXXXXXXXXXX equations, we can XXX rid XX XXX term ‘XX’ by adding both XXXXXXXXX ii and XXX. XXXX XXXXX: </p> <p> XXX + ct= 126 </p> <p>+ 40t<img width="67" XXXXXX="19" src="XXXX:///C:/Users/XXXXX/XXXXXXX/XXXXX/XXXX/msohtmlclip1/XX/XXXXXXXXXXXXX.XXX" v:shapes="XXXXXXXXXXXX"> </p> <p><XXX width="121" height="2" src="XXXX:///X:/Users/XXXXX/AppData/Local/XXXX/XXXXXXXXXXXX/XX/clip_image007.XXX" v:shapes="XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"> <XX> </p> <p> XXX = XXX </p> <p>t= <img width="XX" height="26" src="file:///X:/Users/ARESE/AppData/Local/Temp/msohtmlclip1/XX/XXXXXXXXXXXXX.XXX" v:shapes="XXXXXXXXXXXX"> </p> <p>t=3 XXXXX </p> <p>Substitute or XXX ‘t=3 hours’ in XXXXXXXX XX </p> <p>(40+c)<img width="XX" XXXXXX="19" src="XXXX:///C:/XXXXX/XXXXX/XXXXXXX/Local/XXXX/msohtmlclip1/XX/clip_image011.XXX" v:XXXXXX="_x0000_i1025"> </p> <p>XXX+ 3c= 126 </p> <p>XX= XXX-120 </p> <p>3c= 6 </p> <p>C=<img width="6" XXXXXX="XX" XXX="XXXX:///C:/XXXXX/XXXXX/AppData/Local/Temp/XXXXXXXXXXXX/XX/clip_image013.XXX" v:shapes="XXXXXXXXXXXX"> </p> <p>X=2 XXX </p> <p><XXX width="XX" height="X" XXX="XXXX:///C:/XXXXX/XXXXX/XXXXXXX/XXXXX/XXXX/msohtmlclip1/XX/XXXXXXXXXXXXX.XXX" v:shapes="XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"><img width="XX" XXXXXX="2" src="XXXX:///C:/XXXXX/ARESE/AppData/XXXXX/Temp/XXXXXXXXXXXX/XX/XXXXXXXXXXXXX.png" v:shapes="XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX">Speed XX XXXXXXX= XXXX </p> <p> </p>">
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