a car moves with a speed of 30 km per hour for half an hour 25 km per hour for 1 hour and 40 km per hour for 2 hour calculate the average speed of car
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20 km per hour ia average speed
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Solution:
Average speed = Total distance/Total time taken
Hence, there time taken = (1/2+1+2)h
= (3+1/2)h = 7/2h
Total distance = For 1st case
distance = speed×time
= 30 × 1/2
= 15km
For 2nd case
distance = 25 × 1
= 25km
For 3rd case
distance = 40 × 2
= 80km
Hence, total distance = (15+25+80)km
= 120 km
therefore, average speed = 120/ 7/2
= 120×2/ 7
= 240/7
= 34.3 ( appr. )
Thanks for asking
Average speed = Total distance/Total time taken
Hence, there time taken = (1/2+1+2)h
= (3+1/2)h = 7/2h
Total distance = For 1st case
distance = speed×time
= 30 × 1/2
= 15km
For 2nd case
distance = 25 × 1
= 25km
For 3rd case
distance = 40 × 2
= 80km
Hence, total distance = (15+25+80)km
= 120 km
therefore, average speed = 120/ 7/2
= 120×2/ 7
= 240/7
= 34.3 ( appr. )
Thanks for asking
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