Exams › GATE › General Aptitude
P, Q, R, and S crossed a lake in a boat that can hold a maximum of two persons, with only one set of oars. The following additional facts are available: (i) The boat held two persons on each of the three forward trips across the lake and one person on each of the two return trips. (ii) P is unable to row when someone else is in the boat. (iii) Q is unable to row with anyone else except R. (iv) Each person rowed for at least one trip. (v) Only one person can row during a trip. Who rowed twice?
- P
- Q
- R
- S
Correct answer: R
Solution
The boat makes 3 forward trips and 2 return trips, with one rower per trip. P cannot row with anyone else, and Q can row only with R, so the feasible pairings force R to participate in more than one trip. By checking all trips so that each of P, Q, R, and S rows at least once, R is the only person who must row twice.
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