# NIELIT 2022 Feb Scientist D - Section D: 25

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If the ratio of speed of doing work of three persons is $2:3:7,$ what is the ratio of time taken by these people to do the same amount of work ?

1. $2 : 14 : 21$
2. $21 : 14 : 6$
3. $6 : 14 : 21$
4. $21 : 14 : 2$

B

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