Crack this puzzle…
Four friends A, B, C, D need to cross a bridge..
A maximum of 2 people can cross at a time..
It is night and they have just 1 lamp.
People that cross the bridge must carry the lamp to see the way..
A pair must walk together at the speed of slower person…
A: 1 minute to cross bridge
B: 2 minutes to cross bridge
C: 7 minutes to cross bridge
D: 10 minutes to cross bridge
Now question is… “what is the total minimum time required by all 4 friends to cross the bridge….?
Scratch your brains… 😃
Take your own time.
Ans: A & B = 2, B Returns = 2, C & D =10, A returns = 1, A & B = 2
Total = 17