can you help 3 persons..they must cross the bridge at the same time,and this bridge can carry only 2 persons?

Answer 1

no way

Answer 2

This is engineering so the bridge is probably rated for a live load no greater than about 6*75 kilos (2 average people weight plus a 50% safety factor all doubled for movement ) plus a whole series of static loads. Make sure that the combined weight of all three people is less than 150 kilos, they are not carrying heavy objects and they don't need to take any further precautions otherwise they should pick a day with no wind, no snow load on the bridge, high atmospheric pressure and creep carefully across the bridge being sure that they are not in step (and preferably well spaced out when all three are on the bridge at the same time).

Answer 3

There is not enough information. If only two can walk across at the same time, the third person can be carried. If the problem is that the bridge cannot support the weight of more than 2 at a time, then three cannot cross at the same time.

Answer 4

well if the 2 people carry the third then there still is only 2 people on the bridge

Answer 5

Person one and person two cross the bridge at 1:00 P.M. on Monday and person three crosses at 1:00 P.M. on Tuesday and all three have crossed at the same time.

Answer 6

since they must cross at the same time, carrying the third would be the only way that i can think of

Answer 7

What you mean "at the same time"? srhysc's convoluted solution is logically the same as "they walk across the bridge one after the other." Is that close enough to the "same" time?

Answer 8

yes... lets give them names: bob john and linda.

bob goes accross. when bob is halfway john goes accross. when bob is off the bridge and john is halfway, linda goes across.

otherwise bob and john could throw linda accross while they walk over the bridge together

Answer 9

You didnot provided proper information.