A train at station P accelerate uniformly from rest until it attain a speed of 100 k/h. It then continues at the speed for some time and decelerate uniformly until it comes to a stop at a station, Q 60 km from P. The total time taken for the journey is an hour. If the rate of deceleration is twice that of the acceleration. Calculate the: (i) Time taken during when the constant is maintained. (ii) Acceleration of the train