Motor-cyclist P started his journey at a speed of 30 km/hr. After 30 minutes, motor cyclist Q started from the same place but with a speed of 40 km/hr. How much time will Q take to overtake P?
[A] 1\ hours
[B] \frac{3}{8}\ hours
[C] \frac{3}{2}\ hours
[D] 2\ hours

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