A car moves with the speed of 30 km/h for half an hour , 25 km /h for one hour and 40 km/h for two hours . Calculate its average speed .
Answers
Answered by
1
Given :
v1 = 30 km/h
t1 = 0.5 h
v2 = 25 km/h
t2 = 1 h
v3 = 40 km/h
t3= 2 h
Av. speed= ?
First let us find the total time,
Total time = t1 + t2 + t3
= 0.5 + 1 + 2
= 3.5
Next we shall find total distance,
s1 = v1 * t1
= 30*0.5
= 15 km
s2 = v2*t2
= 25*1
=25 km
s3 = v3*t3
= 40*2
= 80 km
Now,
For finding average speed,
Total distance ÷ Total time
Total.dist ÷ T.time
= 15+25+80 ÷ 3.5
= 120 ÷ 3.5
= 1200 ÷ 35
= 240 ÷ 7
= 37.27 km/h
Answer: 37.285 km/h
v1 = 30 km/h
t1 = 0.5 h
v2 = 25 km/h
t2 = 1 h
v3 = 40 km/h
t3= 2 h
Av. speed= ?
First let us find the total time,
Total time = t1 + t2 + t3
= 0.5 + 1 + 2
= 3.5
Next we shall find total distance,
s1 = v1 * t1
= 30*0.5
= 15 km
s2 = v2*t2
= 25*1
=25 km
s3 = v3*t3
= 40*2
= 80 km
Now,
For finding average speed,
Total distance ÷ Total time
Total.dist ÷ T.time
= 15+25+80 ÷ 3.5
= 120 ÷ 3.5
= 1200 ÷ 35
= 240 ÷ 7
= 37.27 km/h
Answer: 37.285 km/h
Answered by
0
Answer:
As we know that
average speed = total distance covered / total time taken
here, total speed is 30+25km/hr = 55 * 5/18 m/s
total time = 90 mins
so,average time = 15.27 / 90
=0.696
Explanation:
Similar questions