A train is to take 1.5h time between two stations if it travelled with an average speed of 80km /h. If the train travelled with an average speed of 70km/h for first an hour then what should be the average speed for the remaining half an hour so as the train reaches on next stain on scheduled time?.
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Let the each half of the running time be t.
During first half time, speed of car is 80 km/h
Distance covered d1=80t km
During second half time, speed of car is 40 km/h
Distance covered d2=40t km
Total distance covered d=d1+d2=80t+40t=120t
Total time taken T=2t
Average speed vavg=Td=2t120t=60 km/hr
hope it dosent help :)
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