There is a river and four people (A, B, C, D) are on one side. They all have to move to the other side in 17 minutes. There is a boat with a max capacity of 2. Time taken by each person to travel alone is A=1min, B=2min, C=5min, D=10 min. If two people travel together, the time taken by them to cross is max{individual time}. How do they travel to complete the task in the given time?

Question

Accepted Answer

A and B goes together - 2minutes

A comes back - 3(2+1) minutes

C and D goes together - 13(10+3)minutes

B now comes back to receive A - 15(13+2)minutes

A and B goes together now - 17(15+2) minutes

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