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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 + speed of XXXXXXX= ( 40+c ) </p> <p>XXXXXXX XXXX speed in XXXXXXXX (i), </p> <p>(40+c) × t = XXX </p> <p>XXXXXXXXXXX out the brackets </p> <p>40t + ct= XXX (XX’ll call XXXX XXXXXXXX XX) </p> <p>XXXX boat XXXXXXX against XXX XXXXXXX, the speed XX the current XXXXX XXXX XXXX XXXXXXXXX, </p> <p>Total XXXXX XX boat= XXXXX of boat alone<img width="XX" XXXXXX="XX" XXX="file:///X:/Users/ARESE/XXXXXXX/XXXXX/Temp/msohtmlclip1/XX/clip_image004.XXX" v:XXXXXX="_x0000_i1025">XXXXX XX current= (40<img width="11" XXXXXX="XX" src="file:///X:/Users/XXXXX/AppData/XXXXX/XXXX/XXXXXXXXXXXX/01/clip_image004.png" v:XXXXXX="XXXXXXXXXXXX">c) </p> <p>XXXXX, putting this speed in XXXXXXXX (i), </p> <p>(40<img width="11" XXXXXX="XX" src="XXXX:///C:/XXXXX/XXXXX/XXXXXXX/XXXXX/Temp/msohtmlclip1/XX/XXXXXXXXXXXXX.XXX" v:shapes="XXXXXXXXXXXX">c ) × t = 126 </p> <p>XXXXXXXXXXX out the XXXXXXXX </p> <p>40t<XXX width="67" height="XX" XXX="XXXX:///X:/XXXXX/XXXXX/XXXXXXX/Local/Temp/msohtmlclip1/01/clip_image006.XXX" v:XXXXXX="_x0000_i1025">(we’ll call XXXX equation XXX) </p> <p>XXXXXXXXX equations ii and iii </p> <p>XXX + XX= XXX </p> <p>XXX<img width="67" height="XX" src="XXXX:///X:/XXXXX/ARESE/AppData/Local/Temp/XXXXXXXXXXXX/01/XXXXXXXXXXXXX.png" v:shapes="XXXXXXXXXXXX"> </p> <p>Solving these as XXXXXXXXXXXX equations, we can XXX XXX XX XXX XXXX ‘XX’ by adding XXXX equations ii XXX iii. XXXX gives: </p> <p> XXX + XX= 126 </p> <p>+ 40t<img width="XX" height="XX" XXX="XXXX:///X:/XXXXX/ARESE/AppData/Local/Temp/XXXXXXXXXXXX/01/clip_image006.png" v:XXXXXX="_x0000_i1025"> </p> <p><img width="XXX" height="X" XXX="XXXX:///C:/XXXXX/ARESE/AppData/XXXXX/Temp/msohtmlclip1/XX/clip_image007.XXX" v:XXXXXX="Straight_x0020_Connector_x0020_1"> <XX> </p> <p> XXX = XXX </p> <p>t= <XXX width="XX" XXXXXX="26" XXX="XXXX:///X:/Users/ARESE/AppData/XXXXX/Temp/msohtmlclip1/XX/clip_image009.png" v:XXXXXX="_x0000_i1025"> </p> <p>t=3 hours </p> <p>Substitute or put ‘t=X hours’ in equation XX </p> <p>(40+c)<XXX width="65" height="XX" XXX="file:///C:/Users/XXXXX/XXXXXXX/Local/Temp/msohtmlclip1/XX/XXXXXXXXXXXXX.png" v:shapes="_x0000_i1025"> </p> <p>120+ 3c= 126 </p> <p>XX= 126-120 </p> <p>XX= 6 </p> <p>C=<XXX width="X" XXXXXX="XX" XXX="XXXX:///X:/XXXXX/XXXXX/AppData/Local/XXXX/msohtmlclip1/XX/XXXXXXXXXXXXX.png" v:shapes="XXXXXXXXXXXX"> </p> <p>C=X XXX </p> <p><img width="XX" height="X" XXX="file:///C:/Users/XXXXX/XXXXXXX/Local/Temp/msohtmlclip1/01/XXXXXXXXXXXXX.png" v:XXXXXX="XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"><XXX width="XX" height="X" src="XXXX:///X:/XXXXX/XXXXX/XXXXXXX/Local/Temp/msohtmlclip1/01/clip_image014.XXX" v:shapes="Straight_x0020_Connector_x0020_2">XXXXX of current= 2mph </p> <p> </p>">
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