Question

On a certain day, 'P' leaves his house and reaches his school 6 minutes early when traveling at a speed of 5 km/hr. The following day, he reduces his speed by 2 km/hr and ends up reaching his school 10 minutes late. What would be the speed of 'P' if he arrives at his school exactly on time?

A 12 km/h
B 4 km/h
C 8 km/h
D 18 km/h
E None of these
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