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If a student walks from his house to school at 5km/hr he is late by 30 minutes. However, if he walks at 6km/hr he is late by 5 minutes only. The distance of his school from his house
Options:
A .  2.5km
B .  3.6km
C .  5.5km
D .  12.5km
Answer: Option D

Let the required distance be x km. 
Then   If A Student Walks From His House To School At 5km/hr He Is...
 => 12x -10x = 25 
 => 2x = 25 
=> x = 12.5 km



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