Tractors

6 tractors started plowing the field that them 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




Solution:

v=1612=172  62172+4A172=1 12+4A=72 A=60/4=15 d  63172+3B172=1 18+3B=72 B=54/3=18 d  A<B   



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