A is three time efficient than b. if does work in 2x/3 days then A will do in?
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Let A Can complete a work in x days
& B in y days.
A & B together can complete a work in= xy/x+y days(This is a shortchut formula when you are asked to answer two people working together will do same in how many days).
Coming to your question,
LET A can complete in x days. So B can do it in 3x days (3x because A is thrice efficient than B)
Applying the formula
x*3x/x+3x=30
so getting x=40.
So A can complete in 40 days & B can 3*40=120 days.
Step-by-step explanation:
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