Question 1033712
b= bus
c= car
c = 80x 
b = 13+80x
find b = 2c
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13+80x = 2*80x
13+80x = 160x subtract 80x from both sides and flip the equation to get the unknown on the left side -it looks better:
80x = 13
x = 13/80 = 0.1625 hours; 0.1625*60 = 9.75 minutes = 9 minutes and 45 seconds
John