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Thomas takes 7 days to paint a house completely whereas Raj would require 9 days to paint the same house completely. How many days will take to paint the house if both them work together. (Give answers to the nearest integer)?
A4
B2
C5
D3
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Thomas=7 days. so 1 day work is 1/7
Raj= 9 days= so 1 day work is 1/9
Hence if both work together for 1 day they will do 1/7+ 1/9= 16/63
So 16/63 in 1 day
So 1 in 63/16 day i.e approx.=4days
Raj= 9 days= so 1 day work is 1/9
Hence if both work together for 1 day they will do 1/7+ 1/9= 16/63
So 16/63 in 1 day
So 1 in 63/16 day i.e approx.=4days
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