Latest CTS Aptitude Question SOLUTION: Four persons can cross a bridge in 3,7,13,17 minutes. Only two can cross at a time. Find the minimum time taken by the four to cross the bridge.

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(#M40007366) CTS question Number problem Keep an EYE

Four persons can cross a bridge in 3,7,13,17 minutes. Only two can cross at a time. Find the minimum time taken by the four to cross the bridge.

Asked In CTS (12 years ago)

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Parvathy P V  (11 years ago)

ans:20
At minute 0, persons C (13) and D (17) begin crossing. At minute 13, person C is finished and person B (7) starts. At minute 17, D is finished and A (3) can start. At minute 20, both A and B finish.

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Pargat Pal Singh  (12 years ago)

7+3+17+7+7 =41 mins

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k  (7 years ago)

First (17) and (7) going ----->(7) will reach first der in 7 **min-----> remain 10 min left for (17)
Now in that left 10 min (13) will join with (17) -------->As (17) already completed 7 min walk in 10** min he will reach--------> remain 3min for (13)
Now (3) will join with (13) left time is 3 min so that both reached in 3** min.
so totall min to reach is 7+10+3=20

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