A boy travels from school to house with a speed of 20 km/hr . what will be his speed to return the same path . so that , it's average speed is 24km/hr ?
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Average speed= Initial speed+final speed/2
24km/hr= 20km/hr+Final speed/2
24×2=20km/hr+ Final speed
48km/hr–20km/hr=Final speed
28km/hr = Final speed
Therefore, his speed to return the same path is 28km/hr
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