CTS Company Logical Reasoning Direction Sense

Two trains are traveling at 18kmph and are 60 km apart. There is fly in the train. it flies at 80 kmph. It flies and hits the second train and then it starts to oscillate between the two trains. At one instance when the two trains collide it dies. Distance traveled by the fly when both trains collide is?

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CTS Other Question
2,3,6,7
using these numbers form the possible four digit numbers that are divisible by 4. There are 1000 doors that are of the open-close type. When a person opens the door he closes it and then opens the other. When the first person goes he opens-closes the doors in the multiples of 1 i.e., he opens and closes all the doors. when the second goes he opens and closes the doors 2, 4 6 8 respectively. Similarly when the third one goes he does this for 3 6 9 12 15th doors respectively. Find number of doors that are open at last.