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A father and his son start at a point A ...

A father and his son start at a point A with speeds of 12 kmph and 18 kmph respectively, and reach another point B. If his son starts 60 minutes after his father at A and reaches B 60 minutes before his father, what is the distance between A and B?

A

90 km

B

72 km

C

36 km

D

None of the above

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