A train moves with a speed of 30km/hr in the first 15mins, with a speed of 40km/hr the next 15mins and with the speed of 60km/hr the next 30mins. Calculate the average speed of the train for its journey.
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Answer:
Explanation:
Av velocity= ( 30*15/60+40*15/60+ 60*30/60)/(15+15+30)/60
=(450/60+10+30)
=7.5+10+30
=47.5 km/h
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