RRB NTPC 17 January 2017 Paper

Question : 19 of 120

Marks: +1, -0

Ehsaan is twice as good a worker as Kamal and together they finish a piece of work in 29 days. In how many days will Kamal, working alone, finish the work?

Validate

Solution:

(3) Let the time taken by the Kamal to finish the complete work is x days. So, Ehsaan takes =

x/2

Let the total work be 29.
We know

1/(\text "Time taken by kamal")

1/(\text "Time taken by Ehsaan")

1/(\text "Total time")

{ 1 } /{ x } + { 2 }/ { x } = { 1 }/ { 29 }

{ 3 }/ { x } = { 1 } /{ 29 }

x = 87 days = time taken by Kamal to complete work.

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