If 15 men working 12 hours per day perform a job in 14 days,

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If 15 men working 12 hours per day perform a job in 14 days, how long will it take 21 men working 10 hours daily to do the same task ?

[DSSSB TGT 2014 (Science)]

A 12 days

B 13 days

C 14 days

D 10 days