Tractors

6 tractors started plowing the field that they together take 12 days.

Agronomist hesitates to

A) after 2 days to withdraw 2 tractors, or
B) after 3 days to withdraw 3 tractors.

Help him which of these two cases will be plowing done sooner.

Result




Step-by-step explanation:

v=6121=721  62721+4A721=1 12+4A=72 A=60/4=15 d  63721+3B721=1 18+3B=72 B=54/3=18 d  A<B   



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