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Questions and answers by
R.Keerthi Kreeshni
Answers (1)
let d/2 be the distance covered by train with a speed of 30kmph in t1 hours →t1=d/60 it covers d/2 distance with a speed of 45km/h in t2 hours →t2=d/90 average speed = total distance/total time =d/(t1+t2) =1/(1/60+1/90) =1/(3+2)/180 =180/5=36kmph
