L&T Company Numerical Ability Time and Work

A and B together can complete a work in 20 days. B alone can complete in 30 days. If A does the work only half a day daily, then in how many days A and B together will complete the work ? 1)15 days 2)18 days 3)20 days 4)24 days

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L&T Other Question

A businessman sold 3/4 of his stock at a gain of 20% and the rest at a gain of 16%. The overall percentage of gain to the businessman is: 1)19% 2)17% 3)18% 4)20% A train running at 5/12 of its original speed reached a place in 18 hours. How much time (in hours) could be saved if the train would have run at its original speed? 1)7.5 2)10.5 3)15 4)18