L&T Company Numerical Ability Time and Work

A can do a work in 60 days. He works for 15 days and later B alone completes the work in 30 days. In what time will they together complete the work?
(a) 24 days
(b) 25 days
(c) 30 days
(d) 32 days
(e) None of these

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L&T Other Question

The present age of Suraj is 6 times Vijay’s age. The present age of Vijay’s 20 years less than Suraj’s present age. What is the present age of Suraj?
(a) 20 years
(b) 22 years
(c) 18 years
(d) 16 years
(e) None of these
A boat running upstream takes 640 min to cover a certain distance, while it takes 280 min to cover the same distance running down stream. What is the ratio between the speed of the boat and speed of water current respectively?
1) 23: 7
2) 22: 9
3) 23: 8
4) 23: 9
5) 23: 11