Solve.Two plumbers make house calls. One charges $90 for a visit plus $40 per hour of work. The other charges $70 per visit plus $50 per hour of work. For how many hours of work do the two plumbers charge the same?
A. 2 hr
B. 2.5 hr
C. 1.5 hr
D. 1 hr
Answer: A
Mathematics
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= 
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, 
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