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Sunil is driving a car with a velocity of 40 kmph in the direction of the river along the river bank. A boat which is at a distance of 12 km from Sunil crossed him in 8 minutes by rowing against the flow of the river. If the river is flowing with a velocity of 4 kmph, then what is the velocity of the boat?

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Three pipes A, B and C can fill a tank together in 8 hours. A and B can fill the tank together in 16 hours. A and B filled the tank for 8 hours and the remaining is filled by pipe C. What is the time taken by pipe C to fill the tank? The ratio of efficiencies of Rahul and Ramesh to finish the same work is 4 : 5. Rahul worked alone for 8 days and then Ramesh joined him and worked for 16 days to finish the work. In how many days Rahul can finish the work alone?