TCS Company Numerical Ability Number System

30^72^87 divided by 11 gives reminder ?

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TCS Other Question

If I walk at 3 Km/hr i miss the train by 2 min. If however i walk at 4km/hr i reach 2min before the arrival of the train. How far do i walk to reach the station? (68-a)(68-b)(68-c)(68-d)(68-e)=725 then a+b+c+d= ?