. During a journey of 280 km, a bus covers the first 180 km at 45 km/h and the remaining distance at 50 km/h. Find its average speed.
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Answer:
Let the each half of the running time be t.
During first half time, speed of car is 80 km/h
Distance covered d 1
=80t km
During second half time, speed of car is 40 km/h
Distance covered d 2
=40t km
Total distance covered d=d 1 +d 2
=80t+40t=120t
Total time taken T=2t
Average speed
avg
= Td
= 2t120t
=60 km/hr
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