Question 592497
60 copies / minute

Let the number of minutes it worked be m

0.25 hours for warming up.

Total time worked = (m-15) minutes

Total copies produced = 2500

60 copies/minute

2500= 60(m-15)

2500/60 = m-15

m= (2500/60 )+15

m= 56.66 minutes including warmup time