Syntel Company Numerical Ability Algebra

x/y+y/x=40/21(don’t remember the exact value, believe this is the one) find x and y there were 2 questions on train and one was like:

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Syntel Other Question

if x men working x hrs per day can do x units of work in x days, then y men working y hrs/day would be able to complete how many units of work i y days? a goods train starts and after 2 hrs a passenger train at 4km/hr starts and overtakes the goods train after 4 hrs, then the speed of goods train?