Question

a car travels at a speed of 80 kilometre per hour during the first half of its running time and at 40 km per hour during the other half find the average speed of the car...?pls give me accurate answer..​

Answer 1

Answer:

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Answer 2

$\sf{\huge{\underline{\red{Given :-}}}}$

• A car travels at a speed of 80 kilometre per hour during the first half of its running time and at 40 km per hour during the other half .

$\sf{\huge{\underline{\green{To\:Find :-}}}}$

• The average speed of the car .

$\sf{\huge{\underline{\blue{Solution :-}}}}$

Let the time be t.

Speed of car during first half time = 80 km/h

Distance covered during first half = speed × time

➝ 80 × t

➝ 80t

Speed of car during first half time = 40 km/h

Distance covered during first half = speed × time

➝ 40 × t

➝ 40t

• Total distance covered = D1 + D2

➝ 80t + 40t

➝ 120t

• Total time taken = t + t = 2t

The average speed = $\dfrac{Distance}{Time}$

➝ $\cancel{\dfrac{120t}{2t}}$

➝ 60 km/hrs

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