self Maths Puzzle

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?

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self Other Question

HOW MANY NO. BETWEEN 200 AND 400 ARE DIVISIBLE BY 3,5,6 ? 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?