1.

1). 302). 243). 184). 15

Answer»

A can do 1 work in $(\left\{ {\frac{5}{4} \times 24} \right\} = 30)$

LET, B can do the work in x days.

Work remaining $(= \left\{ {1 - \frac{4}{5}} \right\} = \frac{1}{5})$

1/5 of the work was DONE by A and B in 2 days.

$(\frac{2}{{30}} + \frac{2}{x} = \frac{1}{5})$

$(\frac{2}{x} = \frac{1}{5} - \frac{2}{{30}} = \frac{1}{5} - \frac{1}{{15}} = \frac{2}{{15}})$

x = 15



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