Question

A car travels a distance of 2000m.If the first half distance is covered at 40 km/hr and the second half with velocity v and the average velocity is 48 km/hr then the value of v is

Answer 1

V(avg) = [d1 + d2] /[t1 +t2]

48 = [d/2 + d/2] / [(d/2)/40 +(d/2)/V]

48 = 2 / [1/40 + 1/V]

48 = 80V/40+V

48V + 48(40) = 80V

1920= 32V

V = 60km/h

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