40) A body is said to have uniform motion, if it travels equal distances in equal intervals of time, no matter how small these intervals may be. The distance travelled by an object in uniform motion increases linearly. A train travels from one station to the next. The driver of train A starts from rest at time t = 0 and accelerates uniformly for the first 20 s. At time t = 20 s, train reaches its top speed of 25m * s ^ - 1 then travels at this speed for further 30 s before decelerating uniformly to rest. Total time for the journey of train A is 60 s. Another train B is travelling in the parallel of train A with zero initial speed at t = 0 and then accelerates uniformly for first 10 s. At time t = 10 s it reaches its top speed of 30m * s ^ - 1 then travels at this speed for further 20 s, before decelerating uniformly to rest. Total time for the journey of train B is 80 s. a) What is the deceleration of the train A as it comes to rest? b) In which time interval, speed of train B is constant? c) What is the initial speed of trains A and B?

It seems that the information provided describes the motion of two trains, Train A and Train B, with different acceleration and deceleration phases. However, the text is incomplete, and some values and details are missing. To fully analyze the motion of both trains and calculate their total journey times, we need the following missing information:

1. The initial speed of Train A before it starts accelerating.

2. The magnitude of acceleration for Train A during the acceleration phase.

3. The time it takes for Train A to reach its top speed (t1).

4. The top speed of Train A.

5. The time Train A travels at its top speed before decelerating (t2).

6. The magnitude of deceleration for Train A during the deceleration phase.

Similarly, we need the same information for Train B:

1. The initial speed of Train B before it starts accelerating.

2. The magnitude of acceleration for Train B during the acceleration phase.

3. The time it takes for Train B to reach its top speed (tl).

4. The top speed of Train B.

5. The time Train B travels at its top speed before decelerating (t2).

6. The magnitude of deceleration for Train B during the deceleration phase.

Once we have these values, we can calculate the total journey times for both trains using the equations of motion. Please provide the missing information, and I'll be happy to help you calculate the total journey times for Train A and Train B.