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3 years ago

1p

Mathematics

1 answer:

goblinko [34]3 years ago

6 0

Answer:

O 81 km per hour

Explanation

Given parameters:

Number of days traveled = 3 days

Distance covered on the first day = 1080km

Time of travel = 10hrs

Rate of travel = 108km/hr

Time of travel on second day = 12hrs

Rate of travel = 90km/hr

Time of travel on third day = 18hrs

Rate of travel = 60km/hr

Unknown

Average speed = ?

To find the average speed, we sum the distances and divide by the sum of the time.

Average speed = $\frac{Total distance}{total time}$

we do not know the second and third distances;

Distance = speed x time

D2 = 90 x 12 = 1080km

D3 = 60 x 18 = 1080km

Now;

Average speed = $\frac{1080 + 1080 + 1080 }{10 + 12 + 18 }$

Average speed = $\frac{3240}{40}$ = 81km/hr

The average speed is 81km/hr

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