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]

[B]

[C]

[D]

Distance covered by motor cyclist P in 30 minutes.

Relative Speed = 40 – 30 = 10 km/hr

∴ Required Speed = Time taken to cover is km at 10 km/hr

Hence option [C] is correct answer.