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Time & Work(समय और काम)

Dev can hit a target 3 xx in 6 shorts Pawan can hit the target 2 xx in 6 shorts and Lakhan can hit the target 4 xx in 4 shorts. What is the probability that at least 2 shorts hit the target (2)/(3) (b) (1)/(3) (c) (1)/(2) (e) None of these

A chronic disease lasts for a short time.

Astra Builders has to deliver the flats to its buyers on time. Due to this there is a sudden rush of work. Therefore, the company needs to arrange workers to work at the sites at a short notice. The source of recruitment which may be used by the company to tap the casual vacancy is : a. Direct recruitment, b. Advertisement, c. Recommendation of employees, d. Employment Exchange.

Time taken by A to complete a work is 7 days more than the time taken by B to complete the same work. Working together they can complete the work in 12 days. In what time can A alone complete the work ?