Dwayne Johnson was running away with the loot from a heist in his car along with Vin Diesel. One tire was punctured and he dropped down to replace it. While changing the wheel, he dropped the four nuts that were holding the wheel and they fell into a drain. Vin Diesel gave him an idea using which they were able to drive till the rendezvous point.

What was the idea ?

A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
He can swim upstream in that lake in exactly 60 minutes against the lake current.
The length of the lake is 2 km.

How long he can cover the distance of one side at a still lake with no current?

What can you hold in your right hand, but never in your left hand?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

What is the centre of gravity?

Imagine you are in a room with no windows or doors. How will you get out?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

What is the next number in this matchsticks series riddle?