SOLUTION: machine A can do a piece of work in 6 hours , machine B can do the same work in 9 hours. machine A was set to do the piece of work but, after 3 and a half hours, it broke down and
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Question 1149844: machine A can do a piece of work in 6 hours , machine B can do the same work in 9 hours. machine A was set to do the piece of work but, after 3 and a half hours, it broke down and machine B did the rest of the work. find how long the machine B took to do the rest of the work? Answer by ikleyn(52747) (Show Source):
Machine A worked 3.5 hours, then it was broken.
In 3.5 hours, machine A completed = of the whole work;
so, remained to do.
Machine B has rate of work of the job per hour;
so machine B will complete the remaining work in = = hours = hours = hours = 3 hours and 45 minutes. ANSWER
