Rahul while going to market computes the average speed for his trip to be 45km/hr. On his return trip along the same trip there is less traffic and the average speed is 60km/hr. What is the average speed of Rahul's trip?
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Explanation:
average speed
total distance /time taken
let distance =s
(s+s)km/(s/45+s/60)
=2s km/(s/15)h
=15 × 2=30km/h
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