a bus is running at uniform speed of 80km/h find it's speed in m/s
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Let the each half of the running time be t.
During first half time, speed of car is 80 km/h
Distance covered
=80t km
During second half time, speed of car is 40 km/h
Distance covered d2 =40t km
Total distance covered d=d2+d2
=80t+40t=120t
Total time taken T=2t
Average speed = T/d = 120t/2t
=60 km/hr
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