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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 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? Correct Answer R

P is unable to row when someone else is in the boat. So, P can row during return trip only.

Q is unable to row with anyone else except R. So, Q can row during return and can row forward trip with R.

Trip 1 – Forward trip:

Q and R are involved in this trip and Q rowed the trip.

Trip 1 – Return trip:

R rowed the trip

Trip 2 – Forward trip:

P and R are involved in this trip and R rowed the trip.

Trip 2 – Return trip:

P rowed the trip

Trip 1 – Forward trip:

S rowed the trip

So, R rowed twice.

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