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Shobhit is twice as efficient as Rohit. Rohit is twice as efficient as Mohit. All three together complete work in 20 days. In how many days can Rohit and Shobhit together complete the work?

1. 65/3 days
2. 70/3 days
3. 50/3 days
4. 73/3 days

Correct answer: 70/3 days

Solution

Mohit=1 unit/day, Rohit=2, Shobhit=4. Total=7/day. Work=7×20=140 units. Rohit+Shobhit=6/day. Days=140/6=70/3 days. Source answer 50/3 is incorrect (verified: 70/3 is correct and is in options).

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