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Sameer went on his bike from Delhi to Gurgaon at a speed of 60km/hr and came back at a speed of 40km/hr. what is his average speed for entire journey.

CLASS - XI PHYSICS (Kinematics)
The question is incomplete. Distance between delhi and gurgaon is not given. The answers are wrong too.



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Distance between Gurgaon and Delhi = S km

Time taken to go from Delhi to Gurgaon = S / 60 hours

Time taken to return = S / 40 hours

Total time = S [ 1/40 + 1/60 ] = S/24 hours

Average speed for the entire journey = total distance / total time duration 
                     =  2 S / ( S/24)  = 48 kmph
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