4)New world puzzle :There are four

4)New world puzzle :There are four people who want to cross a bridge;

theyall begin on the same side.

- youhave 17 minutes to get them all across to the other side.

- It is night, and they have one flashlight.

- A maximum of two people can cross the bridge at one time.

- Any party that crosses, either one or two people, must have the flashlight with them.

- the flashlight must be walked back and forth; it cannot be throwm.

Each person walk with a different speed :

- person a- 1 min, person b -2 mins, person c-5 mins and person d- 10 mins.

A pair must walk together together at the rate of the slower person's pace.