The radius of a horizontal circular curve on a highway is 120 m. The design speed is 60 km/hour, and the design coefficient of lateral friction between the tyre and the road surface is 0.15. The estimated value of superelevation required (if full lateral friction is assumed to develop), and the value of coefficient of friction needed (if no superrelevation is provided) will, respectively, be

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Correct Answer is : 1/11.6 and 0.24

GATE Civil Engineering (CE) 2017 Shift 1 Solved Paper