A car travels from Banglore to Mysore on a road that is 150 km. long . If first half of the journey is traveled at 60 km per hour and the remaining journey at 80 km per hour . Find the average speed of the car .
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time taken in 1st half=75/60= 5/4 hr
time taken in another half=75/80=15/16hr
total time =5/4+15/16=35/16hr
average speed=total distance/total time
=150/35/16=(150*16)/35=30*16/7=480/7=68.57km/ hr
time taken in another half=75/80=15/16hr
total time =5/4+15/16=35/16hr
average speed=total distance/total time
=150/35/16=(150*16)/35=30*16/7=480/7=68.57km/ hr
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