Solution : A bridge for 2
ZOMBIE ATTACK
There is an 8-year-old boy called Kayo. His sister Kiki is researching Zombies on an island with an old professor and his lab assistant. Because of this Kayo comes to know about the island and he became curious about this. So he went to the island. When there, Kiki told him - “Don’t PRESS this RED button whatever happens”. But Kayo, in his excitement, presses the RED button. That let the ZOMBIES free. It was pitch dark on the island and there was a power cut.
All four of them - Kiki, old professor, the lab assistant, and Kayo ran out. Luckily or unluckily, only Kayo remembered to take along an oil lamp. They had to cross an old bridge to reach the safety of the mainland. The professor accurately estimated the Zombies will take 17 minutes to reach the bridge. Kayo takes 1 minute, Kiki takes 2 minutes, the lab assistant takes 5 minutes and the old professor takes 10 minutes to cross the bridge. All of them need the lamp to cross the bridge. And the bridge can only take 2 people at a time.
Will the four of them cross the bridge before the Zombies attack? If yes, how?
Answer :
Kayo and Kiki go 2
Kayo\Kiki comes back 1
lab assistant and old professor go 10
Kiki\Kayo comes back 2
Kayo and Kiki go 2
17