1.

1). 502). 753). 854). 90

Answer»

Time taken by Rajan and GEETA to complete the WORK = 6 days

As we KNOW, work is directly proportional to time, w/t = constant

Time taken by Ramesh to complete work = 15 days

According to the question,

1/15 + 1/x = 1/6

Where x = time taken by Geeta to complete the same work,

⇒ 1/x = 1/6 – 1/15

⇒ x = 10 days

For finding the EFFICIENCY of Rajan,

1/10 + 1/y = 1/9

Where, y = time taken by Rajan alone to complete the same work,

⇒ 1/y = 1/9 – 1/10

⇒ 1/y = 1/90

∴ y = work efficiency of Rajan = 90 days



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