Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

John is found dead in his office at his desk. The police have narrowed the suspects down to three people: Mrs. Jacob, John’s wife Hena and his business partner Jason . All three visited John on the day of his murder, but all three provide the police with stories of explanation as to the reason for their visit.
Police found John with his wrist watch still on his right arm, a torn up picture of his wife laying on the floor beside the trash can, and an ink pen in his right hand. On the desk, the police found a name plate, a telephone that was off the hook, and a personal calendar turned to the July 5th page with 7B91011 written on it. After examining this evidence, the police knew their suspect. Who was it ?

What does the below image rebus riddle means ?

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I’m tall when I’m young, and I’m short when I’m old. What am I?

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How do you survive?

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If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

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Can you deduce the password from that?

There is something which is always coming but never arrives?