Question : A car covers a distance of 350 km in 5 hours and covers another 450 km at a speed of 90 km/hr. What is the average speed (in km/hr) of the car?
Option 1: 72
Option 2: 82
Option 3: 80
Option 4: 85
Correct Answer: 80
Solution :
Given: A car covers a distance of 350 km in 5 hours.
$\text{Speed} = \frac{\text{Distance}}{\text{Time}}$
The time taken by the car $=\frac{450}{90} = 5$ hours
So, the car covers an overall time of (5 + 5) = 10 hours
The total distance travelled by the car is 350 + 450 = 800 km
The average speed of the car $=\frac{800}{10} = 80$ km/hr
Hence, the correct answer is 80.
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