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 (in hours) will Q take to overtake P

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 (in hours) will Q take to overtake P
1). 1
2). $\frac{3}{2}$
3). $\frac{3}{8}$
4). 2

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