Concept:
- With two markers on one map, the safest route is to fix each position on the map of India first and then read the clues against those positions.
- One marker is on the western coast and the other in the east, so they cannot be confused once located.
Step 1: Read the western marker by its geography.
It sits on the Gujarat shore near the Gulf of Khambhat. Ask which event of the freedom struggle had to take place at the seaside, and the answer is the breaking of the salt law, since salt can only be made where sea water meets the land.
Step 2: Name that place.
It is
Dandi, reached on 6 April 1930 after a march of about 240 miles from Sabarmati. Salt, used by rich and poor alike yet taxed by the colonial state, made an ideal symbol of protest.
Step 3: Read the eastern marker.
It lies in West Bengal near the delta. The remaining clue is the Congress session, and the session held at
Calcutta in September 1920 is the one associated with this region.
Step 4: Cross-check that the pairing is consistent.
The salt march started in Gujarat and ended there, so it cannot belong to the eastern marker. A Congress session needs a large city, which fits Calcutta and not a small coastal village. The pairing holds both ways.
Final Answer: The Gujarat coast marker is
Dandi and the West Bengal marker is
Calcutta, now called Kolkata.