What goes through cities and fields, but never moves?

Andrew’s doctor gives him three pills and tells him to take one every half hour. How much time will have passed by the time Andrew’s taken all three pills?

You board a train. The train will have to enter a tunnel soon. You are claustrophobic. Which place is the best for you to sit?

If six children and two dogs were under an umbrella, how come none of them got wet?

What work can one never finish?

Complete the table series riddle by finding the number that can replace "??".

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?