Last seat of the last coach will be the best option.
There will be very less time spent in the tunnel when compared to a person sitting in the front coach or any other coach.
In this way, he will need to spend the least time possible in the tunnel.

Answer is 6.

Numbers on the left and right add up to the middle number.

3+7=10=8+2

Hence,
4+2=6=1+5

Both will reach the ground at the same time. This happens because acceleration due to gravity is constant for all the objects.

On a sail(sale)boat!

A taxi driver!

The bridge wont’t break. At midway, the car would have used at least 200g of fuels (definitely more than that). So, the weight of the bird won’t have any effect!

Not sure how do we get 100, but for all other numbers, here’s the calculation:

155 = 5*5*5 + 5*5 + 5
258 = 6*6*6 + 6*6 + 6
399 = 7*7*7 + 7*7 + 7
584 = 8*8*8 + 8*8 + 8
819 = 9*9*9 + 9*9 + 9

if we consider, 4*4*4 + 4*4 + 4, we get 84 and NOT 100 as mentioned in the question.

Experience of a human being.

When he/she is a child, there is no experience.
When we are young, there is some experience
When we are old, we have all the experience.

8! = 40320 = 28 days * 24 hours * 60 minutes

Sundae School!