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Question

A car takes 4 hours to travel from Bangalore to Chennai, whereas a flight takes only 30 minutes to travel from Bangalore to Chennai. If the distance from Bangalore to Chennai by road is 400 km and by air is 150 km, find the average speed of flight and the average speed of car respectively.


A
300 km h1, 37.5 km h1
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B
300 km h1, 120 km h1
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C
300 km h1, 200 km h1
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D
300 km h1, 100 km h1
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Solution

The correct option is D 300 km h1, 100 km h1
Given:
Time taken by car, tc=4 hr
Distance travelled by car, dc=400 km
Time taken by flight, tf=30 minutes=0.5 hr
Distance travelled by flight df=150 km

By definition,
Average speed=Total distanceTotal time

Hence, Average speed of flight:
vf=dftf
vf=150 km0.5 hr=300 km hr1
Similarly, Average speed of car:
vc=dctc
vc=400 km4 hr=100 km hr1

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