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?
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.