Hello
BrushMyQuant,
abhimahna, and
BunuelIf we are given that A can do a work in 12 hours and B can do the same work in 18 hours. A started the work and B joined him after 6 hours. How much time will they both take to complete the work?
Let total work = 36
A can do 3 units per hour
B can do 2 units per hour
Together they finish 5 units per hour
A started the work and worked alone for 6 hours. Therefore A finished 18 units of work.
Amount of work left= 36-18= 18
I am confused about the steps from here.
What I dis was, I found new units per hour for both A and B
A= 3/2 UNITS/HOUR
B= 1 UNIT/HOUR
AND got the answer 36/5 which is incorrect.
What is the error in the above method?