Question

# A car moves with a speed of 40 km/hr for 15 minutes and then with a speed of 60 km/hr for the next 15 minutes. What is the total distance covered by the car? Also, find the average speed of the car. [5 MARKS]

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Solution

## Steps: 1 Marks Distance: 2 Mark Average Speed: 2 Mark 15 minutes =1560hrs=0.25 hrs Distance covered in first 15 minutes =speed×time =40×0.25=10 km Speed of car changes to 60 km/hr and it travels for another 15 min. Distance covered in next 15 minutes =speed×time =60×0.25=15 km Total distance covered in 30 minutes = 10 + 15 = 25 km Average speed =Total DistanceTotal time =250.5 = 50 km/hr

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