1.

a train travels some distance with a speed of 30km/h and returns with a speed of 45 km/h. calculate the average speed of the train​

Answer»

36kmphExplanation:LET d/2 be the distance COVERED by train with a SPEED of 30kmph in t1 hours→t1=d/60it COVERS d/2 distance with a speed of 45km/h in t2 hours→t2=d/90average speed = total distance/total time=d/(t1+t2)=1/(1/60+1/90)=1/(3+2)/180=180/5=36kmph



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