Q1 : A car travels the first 3rd distance of ‘x’ at a speed of 10km/hr. the second 3rd at speed of 20km/hr. and the last 3rd at 60km/hr. Determine the average speed of the car over the entire distance ‘x’. Q2 : The train A travelled a Distance of 120 km in 3 hrs. Train B travelled a Distance of 180 km in 4 hrs. Which train travelled faster and by how much?
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Let the total distance travelled be x km Then total time taken = 10x/3+20x/3+60x/3=30x+60x+180x
=1806x+3x+x=18010x=18x hrs Then average speed = =TotaltimetakenTotaldistancetravelled
=x/18x km/hr = 18 km/hr
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