Question 888114
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={{{50/75+90/80+240/120=2/3+9/8+2=16/24+27/24+48/24=91/24=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