Rama alone can do a work in 5 days working 4 hours a day. Seema alone can do the same work in 3 days working 10 hours a day. How many hours do they need to work together in a day to complete the same work in 6 days ?

2 hour

Rama = 5 days x 4 hours = 20

Seema = 3 days x 10 hours = 30

⇒ No. of hours they need to work together in a day to complete the same work in 6 days = \(\frac{60}{(3+2)H}\) = 6 days,   ..(\(\frac{Work}{Efficiency}\) = Time)

⇒ 30H = 60 

⇒ H =2 hours