Question

a truck moves with a speed of 90km/h for 20 minutes and at 60km/h for next 20 minutes. find the average speed of the truck

Answer 1

Heya!
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♦Given that =>
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➡Speed = 90km/hr for 20 minutes .

➡Speed = 60km/hr for next 20 minutes .


=> 20 minutes => 20/60 hours .


⚪Average Speed Vav => Total Distance / Total Time


◾Total Distance = Speed × Time


=> 90 × 20/60 + 60 × 20/60





$\frac{20}{60} \times 90 + \frac{20}{60} \times 60 = > 50km$


◾Total time = 20/60 + 20/60

=> 2/3 hr.


➡Vav. = 50 ÷ 2/3


=> 50 × 3/2

=> 25 × 3


=> 75 km/hr.


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Answer 2

Answer:

this is answer

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