Time and Work - 02

04. A is thrice as good as workman as B and therefore is able to finish a job in 60 days less than B. Working together, they can do it in:

• 120 days
• 2
$20\frac{1}{2}$
days
• 325 days
• 430 days

06. A can lay railway track between two given stations in 16 days and B can do the same job in 12 days. With help of C, they did the job in 4 days only. Then, C alone can do the job in:

• 1
$9\frac{1}{5}$
days
• 2
$9\frac{2}{7}$
days
• 3
$9\frac{3}{5}$
days
• 410

08. A is 60% more efficient than B. In how many days will A and B working together complete a piece of work which A alone takes 15 days to finish?

• 1
$\frac{124}{13}$
• 2
$\frac{113}{13}$
• 3
$\frac{108}{13}$
• 4
$\frac{120}{13}$
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