Question
A car travels 50 km at a speed of 25 km/h and the next
80 km at a speed of 40 km/h. What is the average speed of the car for the entire journey?Solution
The average speed for the entire journey is given by: Average Speed = Total Distance / Total Time The total distance traveled is: 50 + 80 = 130 km Time taken for the first part of the journey: Time = Distance / Speed = 50 / 25 = 2 hours Time taken for the second part of the journey: Time = Distance / Speed = 80 / 40 = 2 hours Total time = 2 + 2 = 4 hours Now, calculate the average speed: Average Speed = 130 / 4 = 32.5 km/h Correct Option: b) 32 km/h
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