Question

rajesh and rajiv can do a work in 18 hour they worke toghether for 8 hours and then rajesh left the work . how long will rajiv take to finsh thework if rajiv alone can do it in 27 hour
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Answer 1

Answer:

Together, they can do 1/18 th of the work in an hour. So, in 8 hours they will have done 8/18 i.e., 4/9 th of the work. Rajiv can do the work in 27 hrs. So, to complete the rest i.e., 5/9 the of the work, he will take 27*5/9, which is 15 hrs.