SOLUTION: A boy travels from home to school at an average speed of 6m.s. He returns from schOol at an average speed of 4m.s. Calculate his average speed for the entire journey

Question 522683: A boy travels from home to school at an average speed of 6m.s. He returns from schOol at an average speed of 4m.s. Calculate his average speed for the entire journey
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A boy travels from home to school at an average speed of 6m.s. He returns from schOol at an average speed of 4m.s. Calculate his average speed for the entire journey
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To school DATA:
rate = 6 m/s ; distance = x meters ; time = x/6 seconds
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From school DATA:
rate = 4 m/s ; distance = x meters ; time = x/4 seconds
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==========
Average speed = (total distance)/(total time) = (2x)/[(x/6)+(x/4)]
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= (2x)/[(4x+6x)/24]
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= (2x)/(5x/12)
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= 24/5 m/s
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= 4.8 m/s
===============
Cheers,
Stan H.
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