Respuesta :

absor201

Answer:

Average speed = 90 km/h

Step-by-step explanation:

Given that:

Distance covered at 100 km/h = 450 km

Time = [tex]\frac{Distance}{Speed}[/tex]

Time = [tex]\frac{450}{100}=4.5\ hours[/tex]

Distance covered at 60 km/h = 90 km

Time = [tex]\frac{90}{60}=1.5\ hours[/tex]

Total distance travelled = 450 + 90 = 540 km

Total time taken = 4.5 + 1.5 = 6 hours

Average speed = [tex]\frac{Total\ distance}{Total\ time}[/tex]

Average speed = [tex]\frac{540}{6}[/tex]

Average speed = 90 km/hr

Hence,

Average speed = 90 km/h

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