A train travels from A to E, with intermediary stations being B, C and D. Ten p

Question

A train travels from A to E, with intermediary stations being B, C and D. Ten parcels with code numbers 101 through 110 were transported between these stations. They are transported based on the following conditions.
(i) Only four parcels, 101, 104, 105 and 107 were loaded at A. One among these was unloaded at B, one at C and two at D.
(ii) 102 and 106 were unloaded at C and 108 which was loaded at B, was unloaded at E.
(iii) Only one parcel was loaded at D, which was 103.
(iv) Only two parcels were unloaded at D and 101 was unloaded at C, the station immediately after the station at which 105 is unloaded.
(v) The number of parcels which were loaded at different stations was different and the number of parcels which were unloaded at different stations was different. No parcel is loaded at E and no parcels is unloaded at A.Which of the following two parcels travel through the maximum number of intermediary stations in the journey?

Answer: Option E

As number of parcels which are loaded and unloaded at different stations are different. The number of parcels loaded or unloaded at a station should be 1 or 2 or 3 or 4.According to the given conditions the loading and unloading at different station is as follows.
StationsLoaded ParcelsUnload Parcels A101, 104, 105, 107
B 108 105 C
102, 106, 101 D 103
E
108
Two of 101, 104, 105, 107 are unloaded at D. They are 104 and 107. As 102 and 106 are unloaded at C. They must have been loaded at B.So, 109 and 110 should have been loaded at C.As one parcel is unloaded at B, three are unloaded at C, two at D, four must have been unloaded at E.So, they are 108, 103, 109 and 110.The final order of loading and unloading is as follows.
StationsLoaded ParcelsUnloaded Parcels A101, 104, 105, 107 --- B 108, 102, 106 105 C 109, 110 102, 106, 101 D 103 104, 107 E ---103, 108, 109, 110
104 and 107 travel through the maximum number of intermediary stations.

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