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  1. A

    According to I.R.C. recommendations, the absolute minimum radius of curve for safe operation for a design speed of 100 Kilometer per Hour is -

    e+f =v(sq.)/127R where,e=0.07 & f= 0.15 so the answer is approx. 357 as it is for maximum superelevation so for safest value it will be 400
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