Solve the Problem. -Jane Wants to Buy a Photocopier. the Salesman Has the Salesman

Multiple Choice

Solve the problem.
-Jane wants to buy a photocopier. The salesman has the following information on 3 models. If all 3 are used, a specific job can be done in 50 minutes. If copier A operates for 20 minutes and copier B for 50 minutes, one-half
The job is finished. If copier B operates for 30 minutes and copier C for 80 minutes, three-fifths of the job is done.
Which is the fastest copier, and how long does it take for this copier to finish the whole job?

A) C is fastest; 100 min
B) A is fastest; 120 min
C) B is fastest; 100 min
D) C is fastest; 120 min