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A train travels 20 km at a uniform speed of 60 km per hour and the next 20 km/h at uniform speed of 80 km per hour calculate its average speed |
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Answer» AVERAGE SPEED=Total distance÷total TIME In case-1 distance=20km speed=60km/h time=20km÷60km/h=1/3h In case -2 distance=20km speed=80km/h time=20km÷80km/h=1/4h Total distance=20km+20km=40km Total time =1/3h+1/4h= 7/12h Average speed= 40km÷7/12h=68•571km/h(approximate ANSWER). |
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