RRB Group D 23-Oct-2018 Shift 3 Solved Paper

Question : 7 of 100

Marks: +1, -0

Ratul and Pratul together can complete a task in 18 days. They start the task together, but Ratul had to leave 7 days before the work got over. As a result it took a total of 23 days to complete the task. How many days would it have taken Pratul to complete the work by himself?

Validate

Solution:

{1}/{{R}}+{1}/{{P}}={1}/{18}

({1}/{{R}}+{1}/{{P}} )(23-7)+ {1}/{{P}}

×7=1

{1}/{18} \×16+{7}/{{P}}=1

{7}/{{P}}={1}/{9}

{P}=63

days

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