A and B can do a work in 8 days, B and C can do the same work in 12 days. A, B and C together can finish it in 6 days. A and C together will do it in :

Two pipes A and B can fill a tank in 36 min. and 45 min. respectively. Another pipe C can empty the tank in 30 min. First A and B are opened. After 7 minutes, C is also opened. The tank filled up in:

• [A] 39 min.
• [B] 46 min
• [C] 40 min.
• [D] 45 min.

A can do a piece of work in 4 hours; B and C together can do it in 3 hours, while A and C together can do it in 2 hours. How long will B alone take to do it?

• [A] 8 hours
• [B] 10 hours
• [C] 12 hours
• [D] 24 hours

Amit and Babu can do a piece of work in 18 days; Babu and Chandu can do it in 24 days Amit and Chandu can do it in 36 days. In how many days will Chandu finish it alone?

• [A] 144
• [B] 124
• [C] 64
• [D] 81
• [E] None of these

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:

• [A] 9 ¹/₅ days
• [B] 9 ²/7 days
• [C] 9 ³/₅ days
• [D] 10

A alone can do a piece of work in 6 days and B alone in 8 days. A and B undertook to do it for Rs. 3200. With the help of C, they completed the work in 3 days. How much is to be paid to C?

• [A] Rs. 375
• [B] Rs. 400
• [C] Rs. 600
• [D] Rs. 800