Param can do a piece of work alone in 24 hours, and Charan can do the same work alone in 30 hours. If they work together, what fraction of the work can they complete in 1 day?

$\frac{3}{40}$

Param = 24 hrs, Charan = 30 hrs,

⇒ Fraction of total work Param and Charan can do in 1 day = (5 + 4) x 1 = 9 units,   ..(Efficiency × Days = Total work)

⇒ \(\frac{9}{120}\) = \(\frac{3}{40}\),

Therefore, Both of them can do \(\frac{3}{40}\) of work in 1 day.