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The answer is 3.75 km.. Take walking speed as xkm/hr. then x km/hr takes 45 min(3/4 hr) (x+10)km/hr takes 15 min(1/4hr) equating, we get x as 5km/hr. 1 hour by walk he can travel 5 km,, then by walkinfor 45 min he can travel 3.75 km..

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Q: Sandy rides his bike to school in 15 minutes. Riding is ten kilometres faster than walkingWhen hel walks it takes 45 minutesHow far away is the school?
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