Question

Arvind can finish painting a table in 3 hours. Raghu can do the same work in 9 hours. How long would they take if they both paint the
table together?
hours
(Write your answer till 2 decimal places)

Answer 1

Answer:

2.25

Step-by-step explanation:

Answer 2

Answer:

keep in mind

if A does the work in x hours and

B does the same work in y hours

then A and B both does the same work in xy/(x+y) days

so in above question, paint will be completed in (3*9)/(3+9)

so the answer is 27/12=2.25