Direction: Study the following information carefully and answer the given questions.

Six motorists P, Q, R, S, T and U took part in a race. The person with highest speed won the race.
The speed of P is two third of the speed of R. The speed of U is a perfect cube. The speed of S is 10 km/hr more than R. The speed of P is 100 km/hr and he is last to finish the race. The speed of Q is 30 km/hr more than S. Q is first to finish the race. The speed of R is average of the speed of T and S.