Question
A car travels a distance of 200 km at the speed of 40
kmph. If it covers the next 120 km of its journey at the speed of 60 kmph and last 60 km of its journey at the speed of 20 kmph.What is the average speed of the car?Solution
D 1= 200 Km, S1= 40 Km/hr, D2= 120 Km, S2 = 60 Km/hr, D3= 60 Km, S3= 20 km/hr. T 1 = Distance/Speed = 200/40 = 5 hr T2 = Distance/Speed = 120/60 = 2 hr T3 = Distance/Speed = 60/20 = 3 hr Average speed = Total distance/Total time = 380/10 = 38 km/hr
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