Can you replace the question mark with the correct number?

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?

In the picture given below, can you find out which digit will take place of the question mark?

Name a key which is hardest to turn.

Spot what is wrong here in below Picture?

A chicken farmer has figured out that a hen and a half can lay an egg and a half in a day and a half. How many hens does the farmer need to produce one dozen eggs in six days?

Buy me, smell me or deliver me, I do not change.

Who am I?

Who are the happiest people in IPL match?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

I welcome the day with a show of light, I stealthily came here in the night. I bathe the earthy stuff at dawn, But by noon, alas! I'm gone.