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if someone cycled from home to school at a speed of 4km/ h and back at a speed of 5km/h. The whole journey took 2h 15mins. What is the distance from home to school?
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Let distance from home to school be "X"

Time =Distance/speed

Time of first journey=X/4

Time of back journey=X/5

X/4+X/5=2.25

9X/20=2.25

X=2.25×20/9=50/9=5.55 Km

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