Colin has a small business servicing computers. He currently has 23 computers awaiting servicing. He has two technicians, one of whom takes 1 hour 30 minutes to complete each service, the other takes 2 hours 15 minutes. They never work on the same computer. The company works Monday to Friday, from 9 am to 5 pm, with a lunch break from 1 pm to 2 pm. It is now 9 am on Monday morning.

When, to the nearest half hour, will the current waiting list be completed?

A 5.00 pm on Wednesday
B 10.30 am on Thursday
C 11.00 am on Thursday
D 3.00 pm on Thursday

The first technician takes 1 hour 30 minutes to complete each service, the other takes 2 hours 15 minutes. The company works from 9 am to 5 pm = 8 hours and there is a break of 1 hour. The company works for 8 - 1 = 7 hours.

The number of computers, the first technician does each day = 7 hrs / 1 hr 30 min = 14/3 computers

The number of computers, the second technician does each day = 7 hrs / 2 hr 15 min = 28/9 computers.

At 5.00 pm on Wednesday, the first technician would have completed 14 computers and the second technician would have completed 9.3 computers, given a total of 23.3 computers.