A train cover a distance of 105 km at the speed of 70 km/h, the next 112 km at the speed of 56 km/h and the last 68 km in one hour. find the average speed of the train.
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Answer:
63.33 km/h
Step-by-step explanation:
Case I:
Distance = 105 km
Speed = 70 km/h
Time = Dist./Speed = 105/70 = 1.5 hrs
Case II:
Distance = 112 km
Speed = 56 km/h
Time = Dist./Speed = 112/56 = 2 hrs
Case III:
Distance = 68 km
Time = 1 hrs
Now, we know that
Average Speed = Total Dist./Total Time
= 105+112+68 km/1.5+2+1 hrs
= 285/4.5
= 63.33 km/h
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