a car travels first 450 kms at a spped of 90kmph and remaining 750 km at speed of 50 kmph
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To obtain average speed first we have to take out the time travelled in each criteria like first when the car travels 450 km at a speed of 90 km per hour we have to find the time travelled which will be equal to 5 hour and for the second one the time will be equal to 15 hours now average speed is equal to Total distance upon total time so we obtain 450 + 750 which is equal to 1200 upon 5 8 15 hours which is equal to 20 hours and hence the answer obtained is 60 km per hour
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