SOLUTION: a train travel first 50km at speed of 75 km/hr next 90km at speed of 80km/hr and other 240km at aspped of 120km/hr find the total time taken and avg speed of train?

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Question 888114: a train travel first 50km at speed of 75 km/hr next 90km at speed of 80km/hr and other 240km at aspped of 120km/hr find the total time taken and avg speed of train?
Answer by lwsshak3(11628) About Me  (Show Source):
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a train travel first 50km at speed of 75 km/hr next 90km at speed of 80km/hr and other 240km at a speed of 120km/hr find the total time taken and avg speed of train?
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travel time=distance/speed
total travel time=50%2F75%2B90%2F80%2B240%2F120=2%2F3%2B9%2F8%2B2=16%2F24%2B27%2F24%2B48%2F24=91%2F24=3.79+
total distance traveled=50+90+240=380
average speed=total distance traveled/total travel time=380/(91/24)=100.22
total time taken=3.79 hrs
avg speed of train=100.22 km/hr