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A car travels from Chennai to Bengaluru with a speed of 60 km/hr and returns back along the same path with a speed of 40 km/hr. The average speed of the car is given by : (answer in km/hr)
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Answer:
48 km/hr
Explanation:
The distance- d
Speed in one direction- 60 km/hr
Speed in opposite direction- 40 km/hr
Time in one direction- t1=d/60
Time in opposite direction- t2=d/40
Average speed of the car s= 2d/(t1+t2)
t1+t2= d/60+d/40= 5d/120=d/24
s=2d/d/24=2*24=48 km/hr
Average speed of the car is 48 km/hr
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