A mechanic spent 
h changing spark plugs, 
h changing an air filter and 
style="vertical-align:-10px;" varid="variable_id_field" variablename="impvar_c00e441699f54e24b3bfcbed2" class="wirisformula" /> h changing the oil and oil filter. How much total time was spent servicing the car?
A. 
hours
B. 
hours
C. 
hours
D. 
hours
E. 
hours
Answer: D
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