1.

A car covers the first half of the distance betweentwo places at a speed of 40 kmh and the secondhalf at 60 kmh. What is the average speed of thecar?[Central Schools 07]

Answer»

let x/2 distance cover in time t1 & another x/2 distance cover in time t2t1 = (x/2)/40t2 = (x/2)/60t1+t2 = x/48average speed = x/(t1+t2) = x/(x/48) = 48Km/hr



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