Question 1091531
StL=x
Rhine=x-160
A=5(x-160)+800=5x
Z=2x
5x-1440=x+x-160+2x
5x-1440=4x-160
x=1280 km St. Lawrence
Rhine is 1120 km
Amazon 6400 km ANSWER
Zambezi is 2560 km.
Check lengths of 3 shorter rivers 4960 km
Amazon is 1440 km longer.