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Armin drove 60 km at a speed of 90 km/h and 80 km in 48 minutes. Find the average speed, in km/h, of Armin's driving.
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Step-by-step explanation:
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
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