Question
A motor car travels a distance of 100 km at the speed of
20 kmph. If it covers the next 140 km of its journey at the speed of 70 kmph and last 60 km of its journey at the speed of 20 kmph. What is the average speed of the car?Solution
D1= 100 Km, S1= 20 Km/hr, D2= 140 Km, S2 = 70 Km/hr, D3 = 60 Km, S3= 20 km/hr. T1= (Distance )/Speed = (100 )/20 = 5 hr. T2 = (Distance )/Speed = (140 )/70 = 2 hr. T3= (Distance )/Speed = (60 )/20 = 3 hr. Average Speed= (Total Distance )/(Total Time) = (300 )/10 = 30 km/hr.
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