There are four people
who want to cross a bridge; they all
begin on the same side. You have 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
thrown, for example.
Person 1 takes 1
minute to cross the bridge, person 2 takes 2 minutes, person 3 takes 5
minutes, and person 4 takes 10 minutes.
A pair must walk together at the rate
of the slower personâ€™s pace. For example, if person 1 and person 4
walk across first, 10 minutes have
elapsed when they get to the other side of
the bridge. If person 4 returns the flashlight, a total of 20 minutes
have passed and you have failed
are three playing cards lying face up, side by side. A five is just to
the right of a two. A five is just to the left of a two. A spade is
just to the left of a club, and a spade is just to the right of a
spade. What are the three cards?
A. The number of false statements here is one.B. The number of false statements here is two.C. The number of false statements here is three.D. The number of false statements here is four.Which of the above statements is true?
is the four-digit number in which the first digit is one-third the
second, the third is the sum of the first and second, and the last is
three times the second?
train runs from A to B at 105 miles per hour; the other runs from B to
A at 85 miles per hour. How far apart were the two trains 30 minutes
prior to their crossing?
Assume 9 is twice 5; how will you write 6 times 5 in the same system of notation?
following verse spells out a word, letter by letter. "My first" refers
to the word's first letter, and so on. What's the word that this verse
describes? My first is in fish but not in snailMy second in rabbit but not in tailMy third in up but not downMy fourth in tiara not in crownMy fifth in tree you plainly seeMy whole a food for you and me
Ken, and Mark are, not necessarily in this order, a quarterback, a
receiver, and a kicker. The kicker, who is the shortest of the three,
is a bachelor. Bill, who is Ken's father-in-law, is taller than the
receiver.Who plays in which position?
Three spies, suspected as double agents, speak as follows when questioned:Albert: "Bertie is a mole."Bertie: "Cedric is a mole."Cedric: "Bertie is lying."Assume that moles lie, other agents tell the truth, and there is just one mole among the three; determine:1.) Who is the mole? 2.) If, on the other hand, there are two moles present, who are they?
twelve marbles, identical in size, shape and color, which single marble
is heavier in weight than the others? You are supplied with a balance
and must conclude your determination using the balance three