options
A) 42.5 Days
B) 40 Days
C) 36.5 Days
D) 37.5 Days
Detailed solution
Lets take it as 100, then
X = 150
Y = 100
X/Y = 150/100 = 3/2
Efficiency of work are in above ratio.
( Efficiency is always inversely proportion to time)
Total work = 15 days ( 2+3) unit
= 75 unit
Complete work
75/2 = 37.5
Answer 37.5