Which mode of transport would help one to reach R starting from Q, but without changing the mode of transport ?
aBoat
bRail
cBus
dAir
AnswerUPSC’s answer is (a).
Draw the links: P-Q by boat and rail; R-S by bus and boat; Q-T by air only; P-R by boat only; T-R by rail and bus. From Q to R on one mode, boat works through P: Q to P by boat, then P to R by boat. Rail fails because P-R is boat only, and the Q-T-R route needs air first. Bus is not available out of Q at all, and air takes Q only to T, from where R is reached by rail or bus.
Why each option is right or wrong
(a) Right. Q to P by boat, then P to R by boat.
(b) Wrong. Rail runs from Q to P, but P to R is boat only.
(c) Wrong. No bus link leaves Q.
(d) Wrong. Air takes Q only to T; T to R is by rail or bus.
Answer: UPSC’s key. Explanation: written by UPSC Grade, not by UPSC.
