A car travels at a speed of 50km hr for 30 minutes,at 30 km/hr for next 15 minutes and then 70km/hr for next 45 minutes. What is the average speed of that car
Answers
Answer:
56.66km/hr
Explanation:
avg speed= total distance / total time
speed1= 50km , t1= 30min= 0.5hr
speed2= 30km , t2= 15min= 0.25hr
speed3= 70km , t3= 45min= 0.75hr
distance1= speed1* t1 = 25km
distance2= 7.5km
distance3= 52.5
total distance= d1+ d2+ d3 = 85km
and, total time= (0.5+0.25+0.75)hr = 1.50hr
thus, average speed= 85/ 1.50
= 56.66km/hr
hence, the average speed of the car is 56.66km/hr.
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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