Question

the average speed of an express train is 20km/hr . more than the average speed of a passenger train. to cover a distance of 360kms. the express train takes 3 hours less than that of the passanger train. find the average speed of express train and passenger train

Answer 1

let passenger train moves at x kmph
so speed of express train is (x+20) kmph
time= distance/speed
difference in time= (360/x)- (360/(x+20))=3
implies 360(x+20-x)=3(x*(x+20))
solve it out to find x=40kmph
and express train runs at 40+20=60 kmph