A person covera 180km,240km and 300km by car, train and bus respectively. Find the average speed of the whole journey if the speed of car,train and bus is 60km/hr,80 km/hr and 50 km/hr respectively
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Answer:
80km\hr
Step-by-step explanation:
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Given:
Distances:
D1 = 180Km
D2 = 240km
D3 = 300Km
Speeds:
S1 = 60 Km/hr
S2 = 80 Km/hr
S3 = 50 Km/hr
To Find:
Average Speed
Solution:
We Know,
Average speed = Average distance / Average time
Distance = speed * time
time = distance/speed
Now,
T1 = D1/S1
T1 = 180/60 = 3 Hrs
T2 = D2/S2
T2 = 240/80 = 3 Hrs
T3 = D3/S3
T3 = 300/50 = 6 Hrs
Average time = ( 3 + 3 + 6 ) / 3
Average time = 12/3 = 4 Hrs
Average distance = (180 + 240 + 300) / 3
Average distnace = 240 Km
so,
Average Speed = 240 / 4
Average Speed = 60 Km/Hr
So, the Average Speed is 60 Km/Hr.
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