Answer
See work.
Work Step by Step
a. $(\frac{55.0 miles}{gallon})(\frac{1.609km}{1mi})(\frac{1 gallon}{3.788L})=23.4 km/L$
b. $(\frac{1500km}{23.36km/L})(\frac{1tank}{45L})=1.4 tank$
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