In a press, there are three types of printing machines, P, Q and R. Machine P can print 10,000 pages in 8 hours, machine Q can finish the same task in 10 hours and machine R can finish the same task in 15 hours. All the three machines start the work at 9 : 00 a.m. Machine P breaks down at 11 : 00 a.m. and machines Q and R finish the task. The approximate time of completion of the job is
1 : 30 p.m.
The correct answer is 1 : 30 p.m.
Use the formula Work = Rate × Time to find unknown values. If efficiency changes or some workers/machines stop, calculate the work done in phases and sum them up to the total work, or find the remaining work and the time needed for the remaining workers/machines. This problem is a classic example of how to handle scenarios where the set of workers changes during the task completion.
Similar Questions
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Important Questions from Time and Work
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Had been one menless, then the number of days required to do a piece of work would have been one more. If the number of Man. Days required to complete the work is 56, how many workers were there?
A can do a piece of work in 16 hours, B and C can do it in 8 hours while A and C can do it 12 hours. How long will B alone take to do it?
- lf 12 men can do a work in 20 days, in how many days will the work be done by 15 men-
