Question

A,B,C and D wants to cross a bridge at night .They have only one mobile with torch light .Only two can cross the bridge at a time .They need torchlight to cross the bridge .Each of them walks at a different speed :
D - 1min
A - 2min
B - 5min
C - 10min
to cross the bridge .A pair must walk together at the rate of the slower people .How these people can cross it within 17mins​

Answer 1

Bridge will be crossed in 17 Mins

Step-by-step explanation:

D & A will  1st cross the Bridge

They will Take 2 Mins

Then A will come back - he will take 1 Min

Then B & C will Cross the Bridge

they will Take  10 Mins

then D will Come Back - he will Take 2 Mins

then D & A will Cross the bridge again in 2 Mins

Total Time Taken = 2 + 1 + 10 + 2 + 2

= 17 Mins

This way they can Cross the Bridge in 17 Mins

Coming back of A & D can be Interchanged too.

then 2 + 2 + 10 + 1 + 2  = 17 Mins

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