13. JUT
iii) A car travels at a speed of 50 km/hr for 30
minutes, at 30 km/hr for next 15 minutes
and then 70 km/hr for next 45 minutes.
What is the average speed of the car?
[Ans: 56.66 km/hr]
Answers
Answered by
40
Answer:
just go through the two basic conceptual formulas and you'll be able to solve every problem like this.
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Answered by
2
Answer:
Explanation:
Average speed= total distance/ total time
Distance=speed*time
As the time given here is in minutes we first need to convert it to hours
30 minutes= 0.5 hours
15 minutes = 0.25 hours
45 minutes = 0.75 hours
Total time
= 30+15+45
=90minutes
=1.5 hours
Total distance= 50*0.5+30*0.25+70*0.75
Total distance=25+7.5+52.5
Total distance=85km
Average speed= 85/1.5
Average speed=56.667km/hr
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