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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= ( 40+c ) </p> <p>XXXXXXX XXXX speed in equation (i), </p> <p>(XX+c) × t = XXX </p> <p>Multiplying out the XXXXXXXX </p> <p>40t + ct= 126 (we’ll call XXXX equation XX) </p> <p>XXXX XXXX travels XXXXXXX the current, XXX XXXXX XX XXX current XXXXX XXXX back XXXXXXXXX, </p> <p>XXXXX speed XX boat= speed XX boat XXXXX<XXX width="11" XXXXXX="XX" XXX="XXXX:///X:/XXXXX/XXXXX/XXXXXXX/XXXXX/XXXX/XXXXXXXXXXXX/01/clip_image004.XXX" v:shapes="XXXXXXXXXXXX">XXXXX of current= (40<XXX width="XX" height="19" src="file:///C:/Users/XXXXX/XXXXXXX/XXXXX/Temp/XXXXXXXXXXXX/XX/XXXXXXXXXXXXX.XXX" v:XXXXXX="XXXXXXXXXXXX">c) </p> <p>XXXXX, putting XXXX speed in equation (i), </p> <p>(XX<img width="XX" height="19" XXX="XXXX:///X:/Users/XXXXX/XXXXXXX/XXXXX/Temp/msohtmlclip1/01/clip_image004.XXX" v:shapes="_x0000_i1025">c ) × t = XXX </p> <p>Multiplying out XXX brackets </p> <p>XXX<XXX width="67" XXXXXX="XX" src="file:///C:/Users/XXXXX/XXXXXXX/Local/XXXX/XXXXXXXXXXXX/XX/XXXXXXXXXXXXX.XXX" v:XXXXXX="_x0000_i1025">(XX’ll call XXXX XXXXXXXX XXX) </p> <p>XXXXXXXXX XXXXXXXXX XX XXX XXX </p> <p>40t + XX= 126 </p> <p>40t<img width="XX" XXXXXX="XX" XXX="XXXX:///X:/XXXXX/XXXXX/XXXXXXX/XXXXX/XXXX/XXXXXXXXXXXX/01/XXXXXXXXXXXXX.png" v:XXXXXX="XXXXXXXXXXXX"> </p> <p>XXXXXXX XXXXX XX XXXXXXXXXXXX equations, we can XXX XXX XX the term ‘XX’ XX adding XXXX equations XX XXX iii. This gives: </p> <p> 40t + ct= XXX </p> <p>+ XXX<XXX width="XX" height="XX" src="XXXX:///X:/XXXXX/XXXXX/XXXXXXX/XXXXX/XXXX/XXXXXXXXXXXX/XX/clip_image006.XXX" v:XXXXXX="_x0000_i1025"> </p> <p><XXX width="XXX" height="2" src="XXXX:///X:/XXXXX/XXXXX/AppData/XXXXX/Temp/XXXXXXXXXXXX/XX/XXXXXXXXXXXXX.XXX" v:shapes="XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"> <XX> </p> <p> 80t = XXX </p> <p>t= <XXX width="19" XXXXXX="XX" XXX="file:///X:/Users/ARESE/AppData/XXXXX/Temp/XXXXXXXXXXXX/01/clip_image009.png" v:shapes="_x0000_i1025"> </p> <p>t=3 XXXXX </p> <p>XXXXXXXXXX or put ‘t=3 XXXXX’ in equation ii </p> <p>(XX+c)<XXX width="65" height="XX" src="file:///C:/Users/XXXXX/XXXXXXX/XXXXX/Temp/msohtmlclip1/01/XXXXXXXXXXXXX.XXX" v:shapes="_x0000_i1025"> </p> <p>120+ 3c= 126 </p> <p>3c= XXX-XXX </p> <p>3c= 6 </p> <p>C=<XXX width="X" XXXXXX="26" XXX="file:///X:/XXXXX/ARESE/AppData/Local/XXXX/XXXXXXXXXXXX/XX/clip_image013.png" v:XXXXXX="_x0000_i1025"> </p> <p>X=2 XXX </p> <p><XXX width="XX" XXXXXX="X" XXX="XXXX:///C:/Users/ARESE/XXXXXXX/XXXXX/Temp/msohtmlclip1/XX/clip_image014.png" v:XXXXXX="Straight_x0020_Connector_x0020_3"><XXX width="56" XXXXXX="2" src="file:///X:/Users/XXXXX/AppData/XXXXX/XXXX/XXXXXXXXXXXX/01/XXXXXXXXXXXXX.png" v:shapes="Straight_x0020_Connector_x0020_2">Speed of current= XXXX </p> <p> </p>">
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