:. If a car travels at a speed of 80 km/h for half of its travel time and 60 km/h for the remaining half of the time, what is the total speed of that car ?
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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 v
avg
=
T
d
=
2t
120t
=60 km/hr
Option C is correct.
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