self Maths Puzzle Logical Reasoning Blood Relations

Four pipes fill a cistern in 15,20,30 and 60 hours.The first was opened at 6 am,the second at 8 am,third at 10 am and fourth at noon.When will the reservoir be full?

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self Other Question

Ramesh can finish a piece of work in 10 days. Rohan is twice as efficient as Ramesh.If they work together how many days will they need to finish the same amount of work? how much time does it take to weight a small change in weight bag among 4 equal bags?