A train covers the first half of the distance between two station at a speed of 40 km per hour and the other half at 60 km per hour then its average speed is
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Time for first half is d/40
Second half is d/60
Avg speed= (d+d)/d/40+d/60
=2d/5d*120
=48m/s
Second half is d/60
Avg speed= (d+d)/d/40+d/60
=2d/5d*120
=48m/s
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