Badri planned to travel to his favourite destination in three different transport modes. he travels 50 km by car, at a speed of 70 km/hr. he covers next 100 km by train at 150 km/hr and rest 400 km, he covers by flight travelling at a speed of 800 km/hr. what is the approximate average speed during the whole journey? (in km/hr)
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distance covered by car=50km
speed=70kmph
so, time is50/70=5/7
distance covered by train=100km
speed=150kmph
so, time=100/150=2/3hrs
remaining distance=400km
speed=800kmph
time=400/800=1/2hrs
total distance=50+150+400=600km
total time taken
= 5/7+2/3+1/2=30+28+21/42
= 79/42
now speed=600/79/42
=600x42/79=318.9 or 319kmph
nawgeeth:
Second distance, ie distance covered in train is 100..not 150km.any ways thanks for the method.. I got correct answer using this method
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